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Service Incident: Global Microsoft 365 Outage (Exchange Online & Microsoft Teams)
Posted by Oliver Claxson on 13 November 2026 09:34 AM
Service Incident: Global Microsoft 365 Outage (Exchange Online & Microsoft Teams)
Issue IDs: EX1550543 / MO1550821
Affected Services: Exchange Online, Outlook, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot
Status: Investigating / Mitigating
Issue Type: Incident
Start Time: 12 November 2026, 16:17 UTC 
User Impact
  • Email & Outlook: Users may be unable to access their mailboxes via Outlook on the web, the desktop client, mobile apps, or REST APIs. Outbound and inbound email delivery may also be delayed. 
  • Microsoft Teams: Calendar access, meeting scheduling, and creating new chats for organisations using Information Barriers may fail. Core instant messaging and active online meetings remain largely functional. 
  • Other Microsoft 365 Services: Features within SharePoint Online, Microsoft 365 Copilot, and Defender Safe Links that rely on Exchange Online integration may experience timeouts or fail to load. 
Scope of Impact
This is a major global Microsoft 365 service disruption affecting business and enterprise tenants across the UK, Europe, the Americas, and Asia-Pacific. Microsoft has confirmed there is no indication of malicious or cyber-security activity. 
Current Status
13 November 2026, 09:30 GMT
Microsoft engineers have identified that a core process on affected servers became overwhelmed, causing servers to fail automated health checks and lose capacity. Microsoft is actively restarting affected servers, isolating regional traffic, and expanding capacity. While early recovery signs are appearing in some regions, full sustained restoration is still underway.
Action Required
  • No action is required on your devices or network. Please avoid repeatedly signing out or reconfiguring email profiles, as this will not bypass the server-side outage. 
  • Live Updates: Administrators and users can track real-time progress via the Microsoft Service Health Status page or the @MSFT365Status on X feed. 
  • Comtec is actively monitoring the situation.
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