Microsoft Outlook experiences widespread sign-in issues as service degradation persists
Updated
Updated · Tom's Guide · Apr 27
Microsoft Outlook experiences widespread sign-in issues as service degradation persists
5 articles · Updated · Tom's Guide · Apr 27
Downdetector reports for Outlook peaked near 1,500 on April 27, with users facing intermittent sign-in failures and unexpected sign-outs, especially on iOS devices.
Microsoft has reverted a recent change but states this has not resolved the problem, and continues to investigate increased error rates and monitor service telemetry for further mitigation steps.
The outage primarily affects consumer Outlook users, while business services remain largely unaffected; similar issues were reported earlier in the day and in previous months, indicating recurring reliability concerns.
Is Microsoft's forced security upgrade breaking email for millions just days before its final deadline?
As Outlook fails again, are centralized cloud services becoming too big and fragile to trust?
Was this massive outage an unavoidable consequence of moving to a more secure internet?
What flaw in Microsoft's system allowed a single change to trigger a global authentication collapse?
How can users tell the difference between a system crash and a major cyberattack?