Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method
ID: EX1188132
Issue type: Incident
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Status
Service Degradation
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Impacted services
Exchange Online
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Details
Title: Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method
User impact: Users may be intermittently unable to access their Exchange Online mailboxes using any connection method.
Current status: Our analysis of provided logs and telemetry indicates that some databases that facilitate Exchange Online mailbox access are experiencing excessive CPU utilization causing some requests to fail, resulting in impact. We're expanding our investigation to identify the specific processes responsible for impact and determine a mitigation strategy.
Scope of impact: This issue appears to be intermittently impacting a small subset of users in customer tenants, though potentially any user access Exchange Online may be intermittently affected.
Next update by: Thursday, November 20, 2025, at 11:30 PM UTC
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