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Widespread Microsoft 365 Outage Disrupts Email and Collaboration Tools

Widespread Microsoft 365 Outage Disrupts Email and Collaboration Tools

First seen 12 Nov 2026, 19:46 UTC • •
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ThreatCluster AI
ThreatCluster •November 12, 2026 at 23:45 UTC
  • •Over 140,000 users reported issues with Microsoft 365 services, including Outlook and Teams.
  • •The outage was caused by unexpected server unavailability, not increased traffic.
  • •Microsoft is investigating the incident, which follows a major patch release addressing vulnerabilities.

On November 12, 2026, Microsoft 365 experienced a significant outage affecting Outlook, Teams, and other services, with over 140,000 users reporting issues. The outage began around 1:26 PM ET, attributed to several servers becoming unexpectedly unavailable, which led to elevated load on remaining infrastructure. Microsoft is investigating the cause but has not linked it to any cyberattack. The incident follows a recent patch release addressing numerous vulnerabilities, including CVE-2026-124194, which was. Users across various regions, including the Americas and Australia, faced disruptions, prompting investigations by local cybersecurity authorities. Microsoft has begun restoring services and redistributing traffic to alleviate the load. As of the latest updates, the situation is still evolving, and full service restoration is ongoing.

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Timeline

2026-11-10
CVE-2026-124194 published
Microsoft released patches for 1,094 vulnerabilities, including a spoofing flaw in Outlook.
Securityweek
2026-11-12
Widespread Microsoft 365 outage reported
Users reported issues accessing Outlook, Teams, and other services, with 140,000 outage reports noted.
Nypost
2026-11-12
Microsoft begins service restoration
Microsoft announced a gradual recovery of services, redistributing traffic and restarting affected servers.
Abc.Au

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Common questions

What services are affected by the outage?
The outage affects Microsoft 365 services, including Outlook, Teams, SharePoint Online, and Microsoft Copilot.
Is there evidence of a cyberattack?
Microsoft has not found any evidence linking the outage to a cyberattack as of now.
What steps is Microsoft taking to resolve the issue?
Microsoft is redistributing traffic, restarting affected servers, and investigating the root cause of the outage.