Microsoft Teams: Update the Teams mobile app to maintain Calendar functionality

🚨 The Signal: Teams mobile app users must update to the latest version by October 2026 to retain Calendar functionality. This ensures compatibility and a reliable user experience, preventing service disruption for unpatched clients.

The Impact

All mobile Teams users are affected, with a low security risk if updates are not applied, primarily impacting functionality.

• Mobile Teams users: Loss of Calendar functionality if app is not updated.
• IT Administrators: Need to communicate and enforce mobile app updates.

The Action

1. Communicate to all mobile Teams users the requirement to update their Teams app by October 2026.
2. Encourage users to enable automatic updates for the Teams mobile app on their devices.
3. Monitor user adoption of the latest Teams mobile app versions within your environment.

Domain: Teams · Impact: low · Workload: Teams · Essential Eight: Patch Applications · ISM: ISM-0304, ISM-1690, ISM-1691, ISM-1692, ISM-1693, ISM-1698, ISM-1699, ISM-1700, ISM-1704, ISM-1807, ISM-1808, ISM-1876, ISM-1901, ISM-1905