Posted inMicrosoft Teams

MC1440980: Microsoft Teams Mobile Requires Latest App Version to Keep Calendar Functionality

4 minutesPosted inMicrosoft Teams
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
63
0 25 50 75 100
HIGH IMPACT • REVIEW RECOMMENDED
Recommended Action:
Review the update and plan any required actions before rollout.
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Primary Audience

Teams AdminsMicrosoft 365 AdminsIT ManagersService Owners
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
The update advances the rollout schedule and confirms that older Teams mobile app versions will lose Calendar access from October 2026. Admins need to ensure all mobile users update their app, configure device management for latest versions, and communicate changes. User impact is moderate because calendar functionality will stop working without the update, requiring clear notice and device compliance. Urgency is high as the deadline is around two months away, and preparation steps include validation and policy adjustments.
65
🛡️ Admin Impact
HIGH
50
👥 User Impact
HIGH
70
⚡ Urgency
HIGH
55
🔧 Effort
HIGH
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Teams mobile users need the latest app version to keep using Calendar. Older versions will lose this feature from October 2026.
👥

END USERS

Users must update the Teams mobile app or lose Calendar access.
🛡️

IT ADMINS

Check managed devices have the latest Teams mobile app, update policies if needed, and inform users and support teams.
📅

ROLLOUT TIMELINE

Upcoming:
October 2026

📢 Official Microsoft Message Center Announcement

(Updated) Microsoft Teams: Update the Teams mobile app to maintain Calendar functionality
Message ID: MC1440980 (Updated)

Updated July 30, 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.

Learn more

[Compliance considerations]

No compliance considerations identified. Review as appropriate for your organization.

Source: Microsoft Message Center • Analysed by MWPro

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