check before: 2025-10-20
Product:
Copilot, Entra, Exchange, Microsoft Graph, Power Platform
Platform:
Developer, Mac, Online, Web, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
Summary:
Exchange Web Services (EWS) in Exchange Online will be blocked starting October 1, 2026. Organizations must migrate active EWS applications to Microsoft Graph, Power Platform, or Copilot Declarative Agents. Review applications, enhance security with MFA, prioritize modernization, and disable EWS when no longer needed.
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 several 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 or Power Platform, or Copilot Declarative Agents.
While we are aware of certain parity gaps in Graph API we can confidently say based on EWS usage telemetry that the vast majority of custom LOB EWS applications can already be safely migrated to alternative technologies.
[When this will happen:]
October 1, 2026
Change Category:
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Scope:
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Release Phase:
Created:
2025-10-21
updated:
2025-11-07
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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summary for non-techies**
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Direct effects for Operations**
Application Functionality Loss
Active EWS applications will stop functioning after EWS is blocked, 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 will experience a sudden loss of access to critical functionalities provided by EWS applications, negatively impacting productivity.
- roles: End Users, Support Staff
- references: https://aka.ms/ewsDeprecationMCP
Increased Security Risks
Without proper migration and security updates, organizations may face increased vulnerability to attacks, especially if EWS applications are not replaced with secure alternatives.
- roles: Security Officers, IT Administrators
- references: https://aka.ms/ewsSecurityGuidanceSMBMCP
Compliance Issues
Failure to migrate EWS applications may lead to non-compliance with organizational policies or regulations, especially regarding data access and security.
- roles: Compliance Officers, IT Administrators
- references: https://learn.microsoft.com/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange
Resource Allocation Strain
Organizations may face unexpected resource allocation issues as teams scramble to migrate applications and address functionality gaps, leading to project delays.
- roles: Project Managers, Application Developers
- references: https://aka.ms/ewsToolsMcp
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 |
| 2025-11-07 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-05 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-04 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-03 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-03 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-02 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-11-01 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-31 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-30 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-30 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-29 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-28 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-27 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-26 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-25 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-25 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-25 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-24 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-24 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-23 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-22 | 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
| 2025-10-21 | 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 ID 6009f132-f149-4391-a1a6-478bc65b1b36 Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern 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 ID fef95295-5986-cc3e-1f1f-572b2f8f6bac, fc8eaab8-e298-47b7-9d2c-abc7f33137af, 00b263e4-3497-4650-b082-3197cfdfdd7c, c55d6177-918e-4745-96d3-1715194bc7e8, 6287b600-88b1-45ce-9e56-4fab9fc07d0b, d2ed0387-a4af-4db0-8d20-8819eeb0b3bc Next Steps Review your application portfolio now to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors.to get an understanding of which apps need to be updated by your organization, and which applications require updates from vendors. Prominent vendor applications include Apple Mail and Calendar for Mac. 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 when you no longer have applications that depend on it. We know there are certain parity gaps in Graph API but based on EWS usage telemetry we know that the vast majority of EWS applications can already be safely migrated to Graph API. We encourage you to take the next step and begin the modernization process. Refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. We also provide a set of open-source tools and tutorials to aid in discovery, analysis and AI assisted modernization of EWS applications. We will publish regular communications as we progress towards this deadline to aid affected tenants in identifying EWS usage. We encourage all customers to monitor Message Center and the Exchange Blog and Deprecation of Exchange Web Services in Exchange Online for related content. Thank you in advance for updating and opening your apps to a wider range of useful and intelligent features on Microsoft Graph. We are extremely excited about the growing opportunities that Microsoft Graph offers to developers, and we remain fully committed to our journey to empower developers to access Microsoft 365 data with the most modern features and tools. |
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