Microsoft Teams: Change of default file open preference

Microsoft Teams will change the default file open preference for Word, Excel, and PowerPoint from Teams to Desktop or Web app starting early May 2026. No admin action is needed; users can revert preferences anytime. This update improves file reliability and aligns with customer feedback. Introduction To improve file reliability and alignment with common customer workflows, Microsoft Teams is updating the default file open preference for Word, Excel, and PowerPoint files. Users who previously selected Teams as their default file opening option will now default to Desktop app or Web app instead. This change reflects customer feedback and ongoing improvements to file performance and consistency across Microsoft 365. When this will happen General Availability (Worldwide, GCC, GCC High, DoD): We will begin rolling out in early May 2026 and expect to complete by mid-May 2026. How this affects your organization Who is affected Users in Microsoft 365 tenants who previously set Teams as their default app for opening Word, Excel, or PowerPoint files. What will happen The default file open preference will change from Teams to Desktop app or Web app. This change applies automatically; no admin configuration is required. Users can manually change their file open preference back to Teams at any time from their Teams settings. There is no change to file storage location or permissions. First run experience dialog shown to users when the updated default file open preference takes effect:  View image in new tab What you can do to prepare Compliance considerations No admin action is required. Consider notifying helpdesk staff and end users about the change to reduce support requests. Optional internal message you can reuse: “If you notice Office files opening in Desktop or Web instead of Teams, this is an expected update. You can change your preference anytime in Teams settings.” Question Answer Does the change allow a user to enable or disable the feature themselves? Yes. Users can change their default file open preference at any time from Microsoft Teams settings to open Word, Excel, and PowerPoint files in Teams, the desktop app, or the web app. Message ID: MC1296482

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