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Users may be unable to connect to their mailboxes in Exchange Online through multiple connection methods

Incident Report for IT

Update

We are continuing to investigate this issue.
Posted Nov 12, 2026 - 12:58 CST

Update

Microsoft is working to mitigate impact, they have confirmed the issue may affect Microsoft 365 service connectivity for users in any region. This expanded from the North America region and now includes authentication to any Microsoft 365 service cloud or local app.
Posted Nov 12, 2026 - 12:50 CST

Investigating

Microsoft has identified connectivity errors occurring on a portion of Exchange Online infrastructure which receives and processes users’ access requests. They have collected networking logs to review to further investigate the source of these errors and confirm their next steps.

Potentially impacted connection methods may include:
- Outlook on the web
- Messaging API (MAPI)
- Exchange ActiveSync (EAS)
- Representational State Transfer (REST) API
Posted Nov 12, 2026 - 12:05 CST
This incident affects: Communication & Collaboration (Microsoft 365 - Outlook (Exchange Online), Microsoft 365 - Teams (Collaboration & Storage), Microsoft 365 - Sharepoint / OneDrive (Storage), Microsoft 365 - Other Apps (PowerApps, Office, etc...)).