Microsoft 365 Global Outage Knocks Out Outlook and Teams
Microsoft 365 services including Outlook, Teams and Copilot went down worldwide for many hours starting Thursday, November 12. Microsoft blamed servers that unexpectedly became unavailable and found no sign of an attack.
⚡ Why it matters
The outage showed how heavily businesses and governments depend on a single cloud provider for email and collaboration. A backup communication plan is part of business continuity.
The outage began on Thursday, November 12, at 1:26 PM ET, according to Microsoft. Downdetector logged a surge of reports for Outlook, Teams, Copilot, OneDrive and Azure.
What happened
In admin center advisory MO1550821, Microsoft said customers might be unable to reach Exchange Online, Teams, SharePoint Online, Defender XDR and other services. It first pointed to elevated infrastructure load, then clarified that the load was not caused by more traffic. A number of servers had unexpectedly gone offline, straining the rest.
Microsoft paused deployments, rebalanced connection traffic across its global infrastructure and restarted affected servers. By Friday morning, November 13, it reported gradual recovery in email access, and later said mail queues were close to normal. Governments and businesses from Japan to Australia and the UK were affected.
Was it an attack?
No. Microsoft said it found no indication of malicious or cyber activity.
Lessons
- Keep an emergency communication channel that does not depend on the same provider.
- Follow the official service health page and Microsoft 365 admin center notices.
- Expect phishing that exploits outages with fake "reactivate your account" messages.
🔗 Sources
This article is original reporting by the Security World editorial team based on the sources listed above; direct quotes are kept short and marked with quotation marks. Corrections and feedback: info [at] securitywd.net.
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