Microsoft warns Teams mobile users to update app now or lose Calendar access
Teams users warned to update before the end of September 2026, or lose access to their calendar.
Microsoft has issued an urgent warning to Teams mobile users on both Android and iOS platforms, urging them to update their apps immediately or risk losing access to the Calendar functionality. Initially set for the end of October 2026, the deadline has been accelerated to the close of September 2026. Only mobile versions of the app are impacted, with web and desktop applications remaining unaffected.
Automatic updates should handle the upgrade without user intervention. Microsoft emphasizes that failure to update will result in the Calendar feature being unavailable on affected mobile devices. The update to version 8.9.0 for iOS and 1416/1.0.0.2026122504 for Android is necessary to ensure compatibility with ongoing Teams service updates and to remain functional after the end of support for Exchange Web Services (EWS) on October 1, 2026.
This change is a direct response to the impending end of support for EWS, which has been under scrutiny due to several security vulnerabilities since its announcement in 2023.
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