check before: 2025-08-15
Product:
Microsoft 365 Apps, Outlook
Platform:
Mac, Online, World tenant
Status:
Change type:
Admin impact, Retirement, Updated message, User impact
Links:
Details:
Summary:
Updated November 11, 2025: Based on customer feedback we have decided not to proceed with this change. Thank you for your feedback.
Details:
Updated November 11, 2025: Based on customer feedback we have decided not to proceed with this change. Thank you for your feedback.
Beginning mid-August 2025, the New Outlook for Mac will become the default experience for users in the Current Channel (version 16.100 and later). As part of this change, the admin preference key EnableNewOutlook-which previously allowed control over the default toggle state-will be retired. Users will no longer be able to switch back to Legacy Outlook starting with version 16.102 in mid-October 2025.
This update reflects our commitment to delivering a modern, performant, and reliable Outlook experience.
[When this will happen:]
Legacy Outlook toggle admin perference i.e. EnableNewOutlook retired: Mid-August 2025 (version 16.100 and later)
Users can no longer switch to legacy Outlook: Mid-October (version 16.102 and later)
Change Category:
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Scope:
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Release Phase:
Created:
2025-06-20
updated:
2025-11-12
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**
Loss of Legacy Features
Users will lose access to features like AppleScript, Import/Export, and Public Folders, which may disrupt workflows that rely on these functionalities.
- roles: End Users, IT Support
- references: https://support.microsoft.com/en-us/office/end-of-support-for-legacy-outlook-for-mac-7b9cf644-7035-4345-a151-8c1c7a65ac25
User Training and Adaptation
Users will require new training materials to adapt to the New Outlook interface and features, leading to potential productivity loss during the transition period.
- roles: End Users, Training Coordinators
- references: https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=Outlook%2CMac
Increased Support Requests
The transition to New Outlook may lead to an increase in support requests as users encounter issues or confusion with the new interface and functionalities.
- roles: IT Support, Help Desk Staff
- references: https://support.microsoft.com/en-us/office/end-of-support-for-legacy-outlook-for-mac-7b9cf644-7035-4345-a151-8c1c7a65ac25
Compatibility Issues
Some users may experience compatibility issues with existing integrations or third-party applications that rely on Legacy Outlook features, impacting their workflow.
- roles: End Users, Application Administrators
- references: https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=Outlook%2CMac
User Resistance to Change
Users accustomed to the Legacy Outlook may resist the change to New Outlook, leading to dissatisfaction and decreased morale among staff.
- roles: End Users, Management
- references: https://support.microsoft.com/en-us/office/end-of-support-for-legacy-outlook-for-mac-7b9cf644-7035-4345-a151-8c1c7a65ac25
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 |
| 2025-11-12 | MC MessageTagNames | User impact, Admin impact, Retirement | Updated message, User impact, Admin impact, Retirement |
| 2025-11-12 | MC IsMajorChange | True | False |
| 2025-11-12 | MC Summary | Microsoft Outlook for Mac will retire the admin preference to switch to legacy Outlook starting mid-August 2025. The New Outlook will become the default for users in the Current Channel, and switching back to Legacy Outlook will be disabled by mid-October 2025. Users should update training materials and notify users of the change. | Updated November 11, 2025: Based on customer feedback we have decided not to proceed with this change. Thank you for your feedback. |
| 2025-11-12 | MC Last Updated | 06/20/2025 00:59:18 | 2025-11-11T21:53:07Z |
| 2025-11-12 | MC Messages | Beginning mid-August 2025, the New Outlook for Mac will become the default experience for users in the Current Channel (version 16.100 and later). As part of this change, the admin preference key EnableNewOutlook-which previously allowed control over the default toggle state-will be retired. Users will no longer be able to switch back to Legacy Outlook starting with version 16.102 in mid-October 2025.
This update reflects our commitment to delivering a modern, performant, and reliable Outlook experience. [When this will happen:] Legacy Outlook toggle admin perference i.e. EnableNewOutlook retired: Mid-August 2025 (version 16.100 and later) Users can no longer switch to legacy Outlook: Mid-October (version 16.102 and later) | Updated November 11, 2025: Based on customer feedback we have decided not to proceed with this change. Thank you for your feedback.
Beginning mid-August 2025, the New Outlook for Mac will become the default experience for users in the Current Channel (version 16.100 and later). As part of this change, the admin preference key EnableNewOutlook-which previously allowed control over the default toggle state-will be retired. Users will no longer be able to switch back to Legacy Outlook starting with version 16.102 in mid-October 2025. This update reflects our commitment to delivering a modern, performant, and reliable Outlook experience. [When this will happen:] Legacy Outlook toggle admin perference i.e. EnableNewOutlook retired: Mid-August 2025 (version 16.100 and later) Users can no longer switch to legacy Outlook: Mid-October (version 16.102 and later) |
| 2025-11-12 | MC Title | Microsoft Outlook for Mac desktop: Retiring the admin preference to switch to legacy Outlook | (Updated) Microsoft Outlook for Mac desktop: Retiring the admin preference to switch to legacy Outlook |
| 2025-11-12 | MC End Time | 12/01/2025 09:00:00 | 2025-11-13T09:00:00Z |
Last updated 3 months ago ago
