Outlook app is very slow and not showing mail today — Nov 12, 2026

The Outlook for Android symptoms reported on November 12, 2026 match Microsoft 365 incident EX1550543, so an administrator should track that incident under Microsoft 365 admin center → Health → Service health rather than reinstalling or reconfiguring the app. ^1^

Check the incident

1. Sign in to the Microsoft 365 admin center using an account with permission to view service health, such as a Service Support admin or Helpdesk admin.
2. Open Health → Service health.
3. Look under Active issues Microsoft is working on for Exchange Online and incident EX1550543.
4. Open the incident to review its latest update and tenant-specific status. After resolution, it moves to Issue history. ^2^

The reported incident affected Exchange Online/Outlook connectivity, including mobile clients. No client or tenant configuration change was identified as necessary while the incident remained active. ^3^

If admin-center access is also unavailable, check the Microsoft service status page or the @MSFT365Status account referenced in Microsoft’s service-health guidance. There was no dependable universal restoration time in the public reports; the tenant’s Service health entry is authoritative.

If Service health says the incident is resolved

If only this Android device still fails afterward, use the least disruptive local recovery sequence:

1. Force-close Outlook and reopen it.
2. In Outlook, open Settings → Accounts → affected account → Reset Account.
3. Wait for the mailbox to resynchronize. Reset Account is Microsoft’s documented recovery step for incomplete or incorrect mobile data. ^4^

Do not delete and re-add the account unless resetting fails after the service incident is closed, because removing the account is the more disruptive next step.

Conditional Android battery check

If mail updates only when Outlook is open—or swiping down still does not synchronize—Android may be restricting Microsoft Authenticator:

• Pixel/Android One: Settings → Apps → Authenticator → App battery usage → Unrestricted
• Samsung: Settings → Apps → Authenticator → Battery → Unrestricted, and remove Authenticator from sleeping or deep-sleeping apps.
• Return to Outlook and swipe down on the message list.

Microsoft specifies changing Authenticator’s battery restriction for this symptom; unrestricted operation can increase battery consumption. ^5^

If EX1550543 is absent or closed but multiple users remain affected, the administrator should select Report an issue from Service health. If only one device remains affected after reset, use Outlook mobile’s Settings → Help & Feedback → Contact Support path or contact the organization’s Microsoft 365 administrator.

References

1. What is going on with Outlook!!!!!!!!!!! - Microsoft Q&A
2. How to check Microsoft 365 service health
3. Multiple Microsoft apps and web services aren't working! - Microsoft Q&A
4. How do I clear the cache or locally reset/refresh the client/app?
5. Outlook mail doesn't sync on Android when in Low Power Mode | Microsoft Support