Outage in Microsoft 365
Users may be unable to access their mailbox with any Exchange Online connection methods
Resolved Minor
August 10, 2026 - Started about 17 hours ago
- Lasted about 2 hours
Incident Report
Summary AI Generated
Microsoft 365 Exchange Online experienced a service disruption on August 11, 2026, lasting approximately 2.3 hours, during which users in Europe were unable to access their mailboxes via any Exchange Online connection method. Monitoring systems detected a drop in service availability, prompting an investigation into service health telemetry and logs. Partial recovery was observed during the investigation, with Microsoft monitoring the environment to determine whether manual intervention was needed to fully resolve the issue.
Title: Potential issues accessing mailboxes via one or more connection methods
User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.
Components affected
Exchange OnlineTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
about 16 hours ago - at 08/11/2026 02:13AM
Title: Users may be unable to access their mailbox with any Exchange Online connection methods
User impact: Users may be unable to access their mailbox with any Exchange Online connection methods.
Current status: We've been alerted by our monitoring systems of impact to the Exchange Online mailbox service. We're investigating the service health telemetry and logs to determine the cause of the drop in service availability. In addition, we're also observing some recovery already, and we're monitoring the environment as it recovers to determine whether any manual intervention is required to ensure the impact is fully resolved.
Scope of impact: Any user in Europe may be impacted and unable to access their mailbox with any Exchange Online connection method. This section may be updated as our investigation continues.
Next update by: Tuesday, August 11, 2026, at 4:30 AM UTC
about 17 hours ago - at 08/11/2026 01:22AM
Title: Potential issues accessing mailboxes via one or more connection methods
User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.
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