MC1440980 High Major change
(Updated) Microsoft Teams: Update the Teams mobile app to maintain Calendar functionality
Summary AI-generated
To maintain Calendar access in Teams mobile, users must update the Teams app on iOS/Android to the latest version; EWS support extends until April 2027, then ends.
Suggested actions AI-generated
- Confirm users run latest Teams mobile app on iOS/Android
- Inform users Calendar requires latest app version
- Encourage automatic app updates
- Verify managed devices deploy latest Teams mobile app
- Communicate to mobile users and support teams
- Ensure iOS version 8.9.0+ and Android version 1416/1.0.0.2026122504+ before October 2026
Written by Azure OpenAI (gpt-4.1) from the text of the post below. It can be incomplete or wrong; the original post is authoritative.
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Original post from Microsoft
Updated July 31, 2026: We have updated the timeline and content. Thank you for your patience.
[What and why]
To ensure continued access to Calendar functionality in Microsoft Teams mobile, users must update the Teams mobile app to the latest version. This change helps maintain a reliable calendar experience on iOS and Android devices and ensures compatibility with ongoing Teams service updates. Teams admins can make some policy changes (see below) and extend EWS until April 2027. EWS will no longer work after that date.
Refer to this link for guidance on updating the policy - Exchange Online EWS
[Rollout schedule]
- Worldwide, GCC, GCC High, and DoD: Beginning early October 2026 (previously late October) and expected to complete early October 2026 (previously late October)
[Impact on your organization]
Who is affected
- All users who access Microsoft Teams from iOS or Android mobile devices
Platforms and services
- Microsoft Teams
- Teams mobile app for iOS
- Teams mobile app for Android
What will happen
- Users who are not running the latest version of the Microsoft Teams mobile app will not be able to access Calendar functionality in Teams mobile.
- Users must update to the latest Teams mobile app version available in the Apple App Store or Google Play Store to continue using Calendar functionality in Teams mobile.
- This change applies only to the Teams mobile app.
- No changes are being made to Teams Calendar functionality on web or desktop clients.
[Action required and recommendations]
Action required.
Complete the following before October 2026:
- Confirm that users are running the latest Microsoft Teams mobile app version available in the Apple App Store or Google Play Store.
- Inform users that Calendar functionality in Teams mobile requires the latest app version and may not be available on older app versions.
- Encourage users to enable automatic app updates on their mobile devices.
- For managed devices, verify that mobile application management solutions are configured to deploy the latest Teams mobile app version.
- Communicate this change to mobile users and support teams.
Ensure these minimum versions are in place before October 2026:
- For iOS - Please update to version 8.9.0 (build 8.9.77.2026092302) or higher.
- For Android - Please update to version 1416/1.0.0.2026122504 or higher
Learn more
- Deprecation of Exchange Web Services in Exchange Online | Clients and mobile in Exchange Online | Exchange Online | Microsoft Learn
- Exchange Online EWS
[Compliance considerations]
No compliance considerations identified. Review as appropriate for your organization.
Additional details from Microsoft
- Summary
- To maintain Calendar functionality in Microsoft Teams mobile on iOS and Android, users must update to the latest Teams app by early October 2026. Older versions will lose calendar access. Admins should ensure updates, inform users, and configure management tools accordingly. This change does not affect desktop or web clients.