check before: 2026-05-21
Product:
Copilot, Entra, Exchange, Microsoft Graph, Outlook, Power Platform
Platform:
Developer, Mac, Online, Web, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
In 2018, we announced that we were no longer making feature updates to Exchange Web Services (EWS) in Exchange Online, and we advised developers to move to Microsoft Graph.
In September 2023, we announced that on October 1, 2026, we will start blocking EWS requests to Exchange Online.
We are now less than 12 months from October 1, 2026. We have made progress on closing most parity gaps with more changes in development to be released in the coming quarters. Please refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information.
You are receiving this notification because there are EWS applications in your tenant.
If you haven't already, start the process of working with your application development organization and your application vendors to either sunset or migrate active EWS applications on your tenant to the Graph API, Power Platform, or Copilot Declarative Agents.
The vast majority of custom EWS applications can be safely migrated to alternative technologies today.
[When this will happen:]
October 1, 2026
Change Category:
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Scope:
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Release Phase:
Created:
2026-05-22
updated:
2026-06-16
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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More Info URL
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additional Info URL
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MS Blog Link
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summary for non-techies**
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Direct effects for Operations**
EWS Application Functionality Loss
If EWS applications are not migrated before the deprecation date, they will cease to function, leading to disruption in business processes that rely on these applications.
- roles: Application Developers, IT Administrators
- references: https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
User Experience Degradation
Users relying on EWS applications may experience a sudden loss of access to critical functionalities, leading to frustration and decreased productivity.
- roles: End Users, Support Staff
- references: https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange
Increased Security Risks
Without proper migration and updates, EWS applications may expose the organization to security vulnerabilities, especially if they are not updated to comply with current security standards.
- roles: Security Officers, IT Administrators
- references: https://aka.ms/ewsSecurityGuidanceSMBMCP
Operational Disruption
Failure to prepare for the transition may result in operational disruptions as teams scramble to find alternatives or workarounds for essential applications.
- roles: Project Managers, Business Analysts
- references: https://aka.ms/ewsDeprecationMCP
Compliance Issues
Organizations may face compliance challenges if they continue to use deprecated technologies that do not meet regulatory requirements, potentially leading to legal repercussions.
- roles: Compliance Officers, Legal Advisors
- references: https://aka.ms/ews1pageMCP
Configutation Options**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-06-16 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-16 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-14 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-14 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-14 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-14 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-12 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-12 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-11 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-11 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-10 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-10 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-08 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-08 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-06 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-06 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-03 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-03 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-03 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-03 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-02 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-02 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-01 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-01 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-06-01 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-06-01 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-31 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-31 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-29 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-29 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-28 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-28 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-27 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-27 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-26 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-26 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-25 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-25 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-24 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-24 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-24 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-24 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
| 2026-05-23 | MC prepare | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/24809a22-279f-4ed3-bf81-52d7b16f88f1 https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 | https://aka.ms/copilotMcp
https://aka.ms/EwsAdminReportsMcp https://aka.ms/ewsBsm https://aka.ms/ewsDeprecationMCP https://aka.ms/ewsSecurityGuidanceSMBMCP https://aka.ms/ewsSecurityMFAMCP https://aka.ms/ewsToolsMcp https://aka.ms/graphMcp https://aka.ms/powerMcp https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/00b263e4-3497-4650-b082-3197cfdfdd7c https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/1babc55c-ccea-49de-83a0-fa69178cdbc6 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/c55d6177-918e-4745-96d3-1715194bc7e8 https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/d2ed0387-a4af-4db0-8d20-8819eeb0b3bc https://entra.microsoft.com/#view/Microsoft_AAD_RegisteredApps/ApplicationMenuBlade/~/Overview/appId/fc8eaab8-e298-47b7-9d2c-abc7f33137af https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055 |
| 2026-05-23 | MC How Affect | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: 24809a22-279f-4ed3-bf81-52d7b16f88f1 (4727 calls) - Likely backup app (ST) - review for ownership (tenant or vendor) and update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. | In October 2026 we will begin disabling EWS on all M365 tenants worldwide. EWS Applications that have not been migrated will stop functioning.
The following applications on your tenant use EWS: Entra Application IDs with EWS traffic and recommendations for next steps: c55d6177-918e-4745-96d3-1715194bc7e8 (1844150 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, fc8eaab8-e298-47b7-9d2c-abc7f33137af (46326 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 00b263e4-3497-4650-b082-3197cfdfdd7c (2995916 calls) - Likely important custom multi-tenant app - review with vendor for update schedule, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc (16199 calls) - Likely LOB app (ST) - review with business and IT to schedule updates, migration or sunsetting, 1babc55c-ccea-49de-83a0-fa69178cdbc6 (251021 calls) - Likely important custom multi-tenant app - review with vendor for update schedule Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization and which ones require updates from vendors. While EWS applications are active on your tenant, lower your risk of a successful attack by reviewing and updating the security practices for your organization. In particular, enable Multi Factor Authentication (MFA) for all users including test accounts. Prioritize EWS app modernization on your engineering schedule to ensure enough time to address any functionality gaps Disable EWS in your tenant or enable Baseline Security Mode when you no longer have applications that depend on it. Note on Apple Mail for Mac Apple Mail for Mac and related applications are some of the most popular EWS applications. We are working closely with Apple to update these applications. In order to run your tenant in the most secure configuration today, users of Apple Mail for Mac would have to switch to an alternative like Outlook for Mac until the applications have been updated. We provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. Thank you in advance for taking steps to improve the security posture of your M365 tenant. We are extremely excited about the growing opportunities that the Microsoft 365 platform offers to developers, and we remain fully committed to our journey to empower developers with the best features and tools. |
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