Posted inMicrosoft Teams

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

3 minutesPosted inMicrosoft Teams
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
64
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

Microsoft 365 AdminsTeams AdminsIT ManagersService Owners
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
The change enforces an updated Teams mobile app version for Calendar functionality starting late October 2026. Admins must ensure users update promptly and configure app management policies for compliance. User impact is moderate as outdated clients will lose calendar access on mobile, requiring app updates and possible support. Urgency is high because there is a hard deadline and required actions before rollout.
65
🛡️ Admin Impact
HIGH
55
👥 User Impact
HIGH
70
⚡ Urgency
HIGH
60
🔧 Effort
HIGH
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Teams mobile users need the latest app version to keep Calendar working. Older versions will lose Calendar access from late October 2026.
👥

END USERS

Users must update the Teams mobile app to keep using Calendar.
🛡️

IT ADMINS

Check managed devices, update policies, and inform mobile users and support teams before late October 2026.
📅

ROLLOUT TIMELINE

Upcoming:
Late October 2026

📢 Official Microsoft Message Center Announcement

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

[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.

[Rollout schedule]

  • Worldwide, GCC, GCC High, and DoD: Beginning late October 2026 and expected to complete late October 2026

[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 late 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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