Users were intermittently unable to access Exchange Online
ID: EX1321282
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Users were intermittently unable to access Exchange Online
User impact: Users were intermittently unable to access Exchange Online.
More info: Users experienced intermittent failures when attempting to access their mailbox, including sign-in failures and connection errors. This impact occurred across various connection methods and client experiences, where access attempts did not complete successfully or timed out.
Final status: We’ve confirmed after a period of monitoring, that the impacted infrastructure self-restored, and service has returned to expected performance levels. We'll closely monitor the service to ensure that it remains healthy.
Scope of impact: Impact was specific to some users served through the affected infrastructure in the Exchange Online service, attempting to access their mailboxes.
Start time: Sunday, May 24, 2026, at 11:00 PM UTC
End time: Monday, May 25, 2026, at 7:15 AM UTC
Root cause: A service issue following an authentication activity led to a condition that disrupted normal authentication behavior and access to Exchange Online.
Next steps: We're analyzing performance data and trends on the affected infrastructure to help prevent this problem from happening again.
This is the final update for this event.
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