Active November 12, 2026: Microsoft Exchange Online Mailbox Outage

Status: Active — Last updated 4:01 PM ET on November 12, 2026

Microsoft is experiencing an outage that is preventing some users from connecting to their Exchange Online mailboxes. This is a Microsoft service issue. It is not caused by Venn, and it affects users whether or not they are working in Venn.

What users are experiencing: Users may be unable to access Outlook and email, Microsoft Teams, SharePoint, OneDrive, Copilot, Planner, To Do, Microsoft Defender, or Microsoft Purview.

Microsoft is working to resolve the issue. You can follow their progress on the Microsoft 365 Service Status page, and your Microsoft 365 administrator can track incident EX1550543 in the Microsoft 365 admin center.
Identified: Approximately 1:10 PM ET on November 12, 2026

We are monitoring Microsoft’s updates and will post here as the situation changes.

Updates

4:01 PM ET — Update: Microsoft reports that a fix has restored service on a subset of affected servers and is now being applied more broadly. Planner, To Do, and Microsoft Purview have been added to the list of affected services. Microsoft’s next update is expected at approximately 5:30 PM ET.

2:27 PM ET — Update: Microsoft has expanded the scope of this outage to include Microsoft Teams, SharePoint Online, Copilot, and Microsoft Defender in addition to Exchange Online. Microsoft reports it is moving traffic off the affected infrastructure to reduce impact. This remains a Microsoft service issue and is not caused by Venn.

1:10 PM ET — Active: Microsoft has confirmed an outage affecting connections to Exchange Online mailboxes. We are monitoring.