Outage in Microsoft 365

Some users may experience issues accessing mailboxes via one or more connection methods in Exchange Online

Resolved Minor
October 02, 2025 - Started about 12 hours ago - Lasted about 4 hours

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Outage Details

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
Latest Updates ( sorted recent to last )
about 10 hours ago - at 10/02/2025 10:12AM

Title: Some users may experience issues accessing mailboxes via one or more connection methods in Exchange Online

User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.

Current status: We've identified a possible configuration change that may be causing impact and are reviewing this change to confirm this theory and to identify a mitigation plan.

Scope of impact: This issue impacts internal Microsoft users only attempting to access their mailboxes via one or more connection methods in Exchange Online.

Next update by: Thursday, October 2, 2025, at 3:30 PM UTC

about 12 hours ago - at 10/02/2025 08:16AM

Title: Some users may experience issues accessing mailboxes via one or more connection methods in Exchange Online

User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.

Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix.

Scope of impact: This issue impacts internal Microsoft users only attempting to access their mailboxes via one or more connection methods in Exchange Online.

Next update by: Thursday, October 2, 2025, at 10:30 AM UTC

about 12 hours ago - at 10/02/2025 07:55AM

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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