check before: 2025-02-28
Product:
Exchange, Microsoft 365 Apps, Microsoft 365 for the web, Outlook
Platform:
Online, US Instances, Web, World tenant
Status:
Change type:
Admin impact, Updated message, User impact
Links:
Details:
Summary:
Microsoft is updating the process to enable/disable new Outlook for Windows and Outlook for the web, starting late January 2025. The rollout will change the CASMailbox parameters, separating the controls for web and Windows versions. Organizations should review configurations and update documentation accordingly. No admin action is required before the rollout.
Details:
Updated February 10, 2025: We have updated the content. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web.
[When this will happen:]
General Availability (Worldwide, GCC): We will begin rolling out late February 2025 (previously late January) and expect to complete by mid-March 2025 (previously mid-February).
Change Category:
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Scope:
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Release Phase:
Created:
2024-11-01
updated:
2025-02-11
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**
Change in Access Control
The change in CASMailbox parameters may lead to confusion among users regarding access to Outlook for the web versus Outlook for Windows, potentially causing disruptions in workflow.
- roles: IT Administrators, End Users
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Documentation Updates Required
Organizations will need to update their internal documentation to reflect the new settings and controls, which may lead to temporary inconsistencies in user guidance.
- roles: IT Administrators, Support Staff
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
User Experience Disruption
Users may experience disruptions if they are not informed about the changes, leading to potential frustration and decreased productivity.
- roles: End Users, Help Desk Staff
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Increased Support Queries
The rollout may lead to an increase in support queries from users who are confused about the new access controls, straining IT support resources.
- roles: Help Desk Staff, IT Administrators
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Potential for Misconfiguration
Without proper preparation, there is a risk of misconfiguration of the new settings, which could lead to users being unable to access necessary tools.
- roles: IT Administrators, End Users
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Configutation Options**
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Opportunities**
Enhanced User Experience through Targeted Access Control
With the separation of controls for Outlook for Windows and Outlook for the web, organizations can tailor access based on user needs. This allows for a more customized user experience, enabling users to leverage the new features of Outlook for Windows while restricting access to the web version if not needed. This can enhance productivity by ensuring users have the tools they need without unnecessary distractions.
- next-steps: Review user roles and requirements to determine who benefits from the new Outlook for Windows. Update user access policies accordingly and communicate changes to affected users.
- roles: IT Administrators, End Users, Department Heads
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Streamlined IT Operations through Documentation Updates
The change necessitates an update in documentation regarding the CASMailbox parameters. By proactively updating internal documentation and training materials, IT can streamline future onboarding processes and reduce confusion among users and administrators, leading to improved operational efficiency.
- next-steps: Assign a team to review and update all relevant documentation. Schedule training sessions for IT staff to ensure they are aware of the changes and can assist users effectively.
- roles: IT Administrators, Training Coordinators, Documentation Specialists
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Proactive Configuration Review for Compliance and Security
The rollout encourages organizations to review their current configurations for compliance with the new settings. This proactive approach can help identify any security gaps or misconfigurations, ensuring that user access aligns with organizational policies and compliance requirements.
- next-steps: Conduct a comprehensive audit of current CASMailbox configurations. Identify any discrepancies and make necessary adjustments to ensure compliance and security standards are met.
- roles: IT Security Officers, Compliance Officers, IT Administrators
- references: https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access, https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook
Potentional Risks**
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IT Security**
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explanation for non-techies**
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change history
| Date | Property | old | new |
| 2025-02-11 | MC Messages | Updated January 29, 2025: We have updated the rollout timeline below. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late February 2025 (previously late January) and expect to complete by mid-March 2025 (previously mid-February). | Updated February 10, 2025: We have updated the content. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late February 2025 (previously late January) and expect to complete by mid-March 2025 (previously mid-February). |
| 2025-02-11 | MC How Affect | We're changing the CASMailbox -OWAEnabled parameter that enables or disables access to user mailboxes using Outlook for the web (formerly known as Outlook Web App or OWA) to block only Outlook for the web and to not affect the behavior of new Outlook for Windows.
You can manage new Outlook for Windows with the CASMailbox-OneWinNativeOutlookEnabled policy. You are receiving this message because our reporting indicates one or more users in your organization may be using the New Outlook for Windows. Note: We will not change any existing value for the settings, but we will change which setting is checked to see if new Outlook for Windows is allowed to run on that computer. Before this rollout, both CASMailbox-OWAEnabled and CASMailboxOneWinNativeOutlookEnabled policies are checked. After this rollout, we will remove the check for CASMailbox-OWAEnabled so you can have the chance to enable new Outlook and still disable Outlook for the web if desired. | We're changing the CASMailbox -OWAEnabled parameter that enables or disables access to user mailboxes using Outlook for the web (formerly known as Outlook Web App or OWA) to block only Outlook for the web and to not affect the behavior of new Outlook for Windows.
You can manage new Outlook for Windows with the CASMailbox-OneWinNativeOutlookEnabled policy. You are receiving this message because our reporting indicates one or more users in your organization may be using the New Outlook for Windows. Note: We will not change any existing value for the settings, but we will change which setting controls if the new Outlook for Windows is allowed for the user. Before this rollout, both CASMailbox-OWAEnabled and CASMailboxOneWinNativeOutlookEnabled policies are checked. After this rollout, we will remove the check for CASMailbox-OWAEnabled so you can have the chance to enable new Outlook and still disable Outlook for the web if desired. |
| 2025-02-11 | MC Last Updated | 01/29/2025 21:20:17 | 2025-02-10T22:15:48Z |
| 2025-01-30 | MC Last Updated | 11/06/2024 00:18:12 | 2025-01-29T21:20:17Z |
| 2025-01-30 | MC Messages | Updated November 5, 2024: We have updated the content. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late January 2025 and expect to complete by mid-February 2025. | Updated January 29, 2025: We have updated the rollout timeline below. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late February 2025 (previously late January) and expect to complete by mid-March 2025 (previously mid-February). |
| 2025-01-30 | MC End Time | 04/18/2025 09:00:00 | 2025-04-28T09:00:00Z |
| 2024-11-06 | MC prepare | This rollout will happen automatically by the specified date with no admin action required before the rollout. Review your current configuration to determine the impact for your organization. You may want to notify your admins about this change and update any relevant documentation.
After this change takes effect, please confirm the OneWinNativeOutlookEnabled policy state for each mailbox. The default value is Enabled. Learn more Enable or disable Outlook on the web access to mailboxes in Exchange Server | Microsoft Learn (will be updated before rollout) Enable or disable access to the new Outlook for Windows | Microsoft Learn (will be updated before rollout) #newoutlookforwindows https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook | This rollout will happen automatically by the specified date with no admin action required before the rollout. Review your current configuration to determine the impact for your organization. You may want to notify your admins about this change and update any relevant documentation.
After this change takes effect, please confirm the CASMailbox OneWinNativeOutlookEnabled policy state for each mailbox. The default value is Enabled. Learn more Enable or disable Outlook on the web access to mailboxes in Exchange Server | Microsoft Learn (will be updated before rollout) Enable or disable access to the new Outlook for Windows | Microsoft Learn (will be updated before rollout) #newoutlookforwindows https://learn.microsoft.com/exchange/clients/outlook-on-the-web/mailbox-access https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook |
| 2024-11-06 | MC MessageTagNames | User impact, Admin impact | Updated message, User impact, Admin impact |
| 2024-11-06 | MC Summary | Microsoft is updating the process to enable/disable Outlook for Windows and Outlook for the web, with changes rolling out from late January to mid-February 2025. The OWAEnabled parameter will only affect Outlook for the web, while the OneWinNativeOutlookEnabled policy will manage new Outlook for Windows. No admin action is required before the rollout. | Microsoft is updating the process to enable/disable new Outlook for Windows and Outlook for the web, starting late January 2025. The rollout will change the CASMailbox parameters, separating the controls for web and Windows versions. Organizations should review configurations and update documentation accordingly. No admin action is required before the rollout. |
| 2024-11-06 | MC Last Updated | 11/01/2024 00:03:57 | 2024-11-06T00:18:12Z |
| 2024-11-06 | MC Messages | We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web.
[When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late January 2025 and expect to complete by mid-February 2025. | Updated November 5, 2024: We have updated the content. Thank you for your patience.
We are changing how you enable or disable the new Microsoft Outlook for Windows and Microsoft Outlook for the web. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out late January 2025 and expect to complete by mid-February 2025. |
| 2024-11-06 | MC Title | Microsoft new Outlook for Windows and Outlook for the web: Changing how to disable/enable | (Updated) Microsoft new Outlook for Windows and Outlook for the web: Changing how to disable/enable |
| 2024-11-06 | MC How Affect | We're changing the OWAEnabled parameter that enables or disables access to user mailboxes using Outlook for the web (formerly known as Outlook Web App or OWA) to block only Outlook for the web and to not affect the behavior of new Outlook for Windows.
You can manage new Outlook for Windows with the OneWinNativeOutlookEnabled policy. You are receiving this message because our reporting indicates one or more users in your organization may be using the New Outlook for Windows. Note: We will not change any existing value for the settings, but we will change which setting is checked to see if new Outlook for Windows is allowed to run on that computer. Before this rollout, both OWAEnabled and OneWinNativeOutlookEnabled policies are checked. After this rollout, we will remove the check for OWAEnabled so you can have the chance to enable new Outlook and still disable Outlook for the web if desired. | We're changing the CASMailbox -OWAEnabled parameter that enables or disables access to user mailboxes using Outlook for the web (formerly known as Outlook Web App or OWA) to block only Outlook for the web and to not affect the behavior of new Outlook for Windows.
You can manage new Outlook for Windows with the CASMailbox-OneWinNativeOutlookEnabled policy. You are receiving this message because our reporting indicates one or more users in your organization may be using the New Outlook for Windows. Note: We will not change any existing value for the settings, but we will change which setting is checked to see if new Outlook for Windows is allowed to run on that computer. Before this rollout, both CASMailbox-OWAEnabled and CASMailboxOneWinNativeOutlookEnabled policies are checked. After this rollout, we will remove the check for CASMailbox-OWAEnabled so you can have the chance to enable new Outlook and still disable Outlook for the web if desired. |
Last updated 1 month ago
