check before: 2025-08-15
Product:
Microsoft 365 Apps, Outlook
Platform:
Mac, Online, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
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.
Details:
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:
2025-06-20
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**
Starting in mid-August 2025, the New Outlook will become the default version for Mac users, with the option to revert to Legacy Outlook being removed by mid-October 2025, though it will not support features like AppleScript and Public Folders.
Direct effects for Operations**
Loss of Legacy Outlook Functionality
Users will no longer be able to switch back to Legacy Outlook, potentially disrupting workflows that rely on features not yet available in the New Outlook.
- 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
Training and Documentation Updates
Training materials and internal documentation will need to be updated to reflect the changes, which may lead to confusion and decreased productivity if not done timely.
- roles: Training Coordinators, End Users
- references: https://support.microsoft.com/en-us/office/end-of-support-for-legacy-outlook-for-mac-7b9cf644-7035-4345-a151-8c1c7a65ac25
Feature Limitations
Certain features like AppleScript, Import/Export, and Public Folders will not be available in the New Outlook, impacting users who depend on these functionalities.
- roles: End Users, IT Support
- references: https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=Outlook%2CMac
User Experience Disruption
The transition to New Outlook may lead to a temporary decline in user satisfaction as users adapt to the new interface and functionalities.
- roles: End Users, Customer Service
- references: https://support.microsoft.com/en-us/office/end-of-support-for-legacy-outlook-for-mac-7b9cf644-7035-4345-a151-8c1c7a65ac25
Increased Support Requests
The change may lead to an increase in support requests as users encounter issues or have questions about the new features 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
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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