A Microsoft 365 outage that started Thursday, November 12, continued into Friday, November 13, 2026. It affected access to Outlook work and school mailboxes and delayed email delivery for some users. Microsoft also reported problems with Teams calendar features, including scheduling and invitations. Most core Teams calls, meetings and chats remained available, according to the company’s service notice. Microsoft Service Health Status · Reuters’ outage coverage
Is Outlook still down?
As of Microsoft’s November 13 update at about 1:18 a.m. EST (06:18 UTC), Microsoft 365 was still listed as degraded. The company was testing ways to restore capacity and stabilize the servers that handle incoming connections. It had seen partial recovery in some regions, but earlier adjustments had failed to keep those services stable. Microsoft’s public notice listed 2 a.m. EST (07:00 UTC) as the time for its next update. Microsoft’s public service notice · The Wall Street Journal’s recovery coverage
Which Microsoft 365 services were affected?
Exchange Online, the service that hosts Microsoft 365 mailboxes, was central to the disruption. Microsoft said the impact could extend to features in other apps that rely on Exchange Online data. That explains how a Teams chat could work while the calendar or meeting invitations failed. Microsoft’s service impact notice · Microsoft incident notices archived by Penn
| Service | What users could experience |
|---|---|
| Outlook and Exchange Online | Mailbox access could fail in Outlook on the web and desktop. Mobile connections could also be affected, and email delivery could be delayed. |
| Microsoft Teams | Calendar views, meeting scheduling, invitations and edits could fail. Microsoft said most core calls, meetings and chats remained functional. |
| Microsoft 365 Copilot | Copilot Chat could fail to load or respond. Features that use work email, calendars or files could also be affected. |
| SharePoint Online | Features tied to Exchange Online could fail. Microsoft said users could still open files stored directly in SharePoint Online. |
| Microsoft 365 admin center | Some pages could fail to load. Microsoft posted the incident on its public status page for administrators unable to access the dashboard. |
Downdetector logged roughly 130,000 U.S. reports of Outlook problems around 1 p.m. EST on Thursday, according to Reuters. That figure counts reports submitted to the tracker. Microsoft’s notices describe the affected features and the company’s recovery efforts. Reuters on U.S. outage reports
What caused the outage?
Microsoft reported that some servers became unavailable, pushing more load onto the servers that were still working. Investigators found that a process involved in establishing secure connections could become overwhelmed and stop the servers from handling requests. Microsoft said it had found no indication of malicious activity and planned to publish a fuller account of the root cause after restoring service. Microsoft’s investigation update · The Guardian’s reporting on the server failures
How to check Microsoft 365 status for your account
- Open the public Microsoft Service Health Status page and expand the Microsoft 365 business or enterprise notice. Personal Outlook.com users can check the consumer products section.
- Ask your workplace or school IT team to check Health > Service health in the Microsoft 365 admin center. Microsoft used EX1550543 for Exchange Online and MO1550821 for the wider Microsoft 365 incident.
- Use a channel your organization already approves for urgent messages. Teams chat or a phone call may be available while email is delayed. Check your Outbox or Sent Items before resending a message.
Microsoft’s guide to checking service health · University of Auckland’s outage notice
Related reading How to tell why a website went down.
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