Outage in Microsoft 365
Some users may be unable to access their mailbox via Exchange ActiveSync (EAS)
Resolved Minor
September 19, 2026 - Started about 3 hours ago
- Lasted about 1 hour
Incident Report
Summary AI Generated
**Summary:** Some users in Europe were unable to access their Exchange Online mailboxes via Exchange ActiveSync (EAS) for approximately 1.4 hours. Microsoft identified the issue through service monitoring telemetry and worked to isolate the root cause and develop a remediation plan. The incident was classified as minor and remained under active investigation at the time of the final update.
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 2 hours ago - at 09/19/2026 01:53PM
Title: Some users may be unable to access their mailbox via Exchange ActiveSync (EAS)
User impact: Users may be unable to access their mailbox via EAS.
Current status: We're reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan.
Scope of impact: Impact is specific to users located in Europe attempting to access their mailbox via EAS.
Next update by: Saturday, September 19, 2026, at 4:00 PM UTC
about 3 hours ago - at 09/19/2026 01:21PM
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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