Some users experienced errors or failures when accessing their mailbox in one or more Exchange Online connection methods
ID: EX1162980
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Some users experienced errors or failures when accessing their mailbox in one or more Exchange Online connection methods
User impact: Some users experienced errors or failures when accessing their mailbox in one or more Exchange Online connection methods
More info: Impact more heavily affected Outlook.com users.
Final status: We’ve confirmed after a period of monitoring that service availability has returned to normal levels and the backlog of messages have been processed.
Scope of impact: Users attempting to access their mailbox in one or more Exchange Online connection methods may have been impacted.
Start time: Tuesday, September 30, 2025 at 11:27 PM
End Time: Wednesday, October 1, 2025 at 11:15 AM
Preliminary root cause: A recent configuration change unexpectedly caused a portion of infrastructure responsible for processing request flow traffic to operate below expected thresholds, resulting in impact.
Next steps:
- We’re analyzing the configuration change to better understand the cause of the impact and to help prevent similar problems in the future.
We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
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