Microsoft 365 Outage Disrupts Outlook, Teams, Copilot and Defender XDR
Summary
Microsoft says servers unexpectedly becoming unavailable caused a widespread Microsoft 365 outage affecting services including Outlook, Teams, Copilot and Defender XDR. It is restoring capacity; the outage remains unresolved.
Key points
- Microsoft's advisory MO1550821 says customers may be unable to connect to services including Exchange Online, Teams, SharePoint Online, Microsoft 365 Copilot and Defender XDR.
- Microsoft attributed the outage to servers unexpectedly becoming unavailable, straining the remaining infrastructure—not to increased traffic.
- Microsoft paused deployments, redistributed traffic, shifted traffic away from affected systems and began restarting servers.
- The ongoing outage began at 1:26 PM ET, and users in any region may be affected; it had not been resolved at the time of the article.
- A separate Teams incident in the Americas earlier that day caused messaging and conversation errors; Microsoft said it was resolved and did not indicate whether the incidents were related.
Article Details
- Event Type
- Widespread Microsoft 365 service outage caused by servers unexpectedly becoming unavailable.
- Impact
- Users worldwide may be unable to connect to services including Outlook, Microsoft Teams, Exchange Online, SharePoint Online, Microsoft 365 Copilot, and Microsoft Defender XDR. Microsoft reported redistributing traffic, pausing deployments, and restarting affected servers; the outage was unresolved at the time of the article. A separate earlier Microsoft Teams incident in North and South America caused messaging and chat problems but was reported as resolved.
Vendors
Products
AzureThursday afternoon across numerous Microsoft services, including Outlook, Microsoft 365, Teams, Copilot, Azure, OneDrive, and the Microsoft Store.CopilotMassive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwideExchange OnlineMicrosoft confirmed that customers may be unable to connect to multiple services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot, and Microsoft Defender XDR.Microsoft 365 Apps for EnterpriseMassive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwideMicrosoft Defender XDRincluding Exchange Online, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot, and Microsoft Defender XDR.Microsoft OneDriveafternoon across numerous Microsoft services, including Outlook, Microsoft 365, Teams, Copilot, Azure, OneDrive, and the Microsoft Store.Microsoft StoreMicrosoft services, including Outlook, Microsoft 365, Teams, Copilot, Azure, OneDrive, and the Microsoft Store.Microsoft TeamsMicrosoft is investigating a widespread outage affecting multiple Microsoft 365 services, including Outlook, Microsoft Teams, and Copilot, as users report connectivity problems worldwide.OutlookMassive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwideSharePoint Onlinemay be unable to connect to multiple services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot, and Microsoft Defender XDR.