Outage in Microsoft 365

Users may experience errors or failures when accessing their mailbox through multiple Exchange Online connection methods

Resolved Minor
November 05, 2025 - Started about 22 hours ago - Lasted about 2 hours

Incident Report

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 Online

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Latest Updates ( sorted recent to last )
about 21 hours ago - at 11/05/2025 05:56PM

Title: Users may experience errors or failures when accessing their mailbox through multiple Exchange Online connection methods

User impact: Users may experience errors or failures when accessing their mailbox through multiple connection methods.

More info: Impacted connection methods are:
- Outlook on the web
- Exchange ActiveSync (EAS)
- Messaging API (MAPI)

Current status: We're reviewing service health telemetry information to identify and isolate errors which may potentially be contributing to impact to assist our root cause investigation.

Scope of impact: This issue may impact users in Europe attempting to access their mailbox in Exchange Online through one of the impacted connection methods.

Next update by: Wednesday, November 5, 2025, at 8:00 PM UTC

about 22 hours ago - at 11/05/2025 05:20PM

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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