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Large Microsoft 365 Outage Affects Global Users

Large Microsoft 365 Outage Affects Global Users

First seen 13 Nov 2026, 01:10 UTC • •
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ThreatCluster AI
ThreatCluster •November 13, 2026 at 06:18 UTC
  • •Microsoft 365 outage on November 12 affected Outlook, Teams, and SharePoint Online.
  • •Over 130,000 users reported issues, with significant impact on third-party AI services.
  • •The outage was due to unexpected server failures, not increased traffic or a cyber attack.

On November 12, 2026, Microsoft 365 experienced a significant outage impacting Outlook, Teams, and SharePoint Online, leaving tens of thousands of users unable to access their services. Downdetector reported over 130,000 incidents related to Outlook alone. The outage was initially attributed to high traffic but later confirmed to be due to unexpected server unavailability, not a denial-of-service attack. The disruption also affected third-party AI services, including OpenAI and Anthropic, which rely on Microsoft’s infrastructure. Microsoft is actively working to restore services by restarting affected servers and redistributing traffic. The full resolution timeline remains unclear as of November 13, 2026.

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Timeline

2026-11-12
Microsoft 365 outage begins
Users worldwide reported issues accessing Outlook and Teams, with over 130,000 incidents logged.
Ciberseguridadlatam
2026-11-12
Microsoft identifies server issues
Microsoft confirmed that unexpected server unavailability caused the outage, not high traffic.
Spiegel.De
2026-11-13
Ongoing restoration efforts
Microsoft continues to work on restoring services and has paused new deployments to alleviate load.
dhnet.be

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Common questions

What services are affected by the outage?
The outage affects Microsoft 365 services, including Outlook, Teams, and SharePoint Online.
Is this a cyber attack?
No, Microsoft confirmed that the outage was due to unexpected server failures, not a denial-of-service attack.
When will services be restored?
Microsoft is actively working on restoration, but a specific timeline for full service recovery has not been provided.