What Caused the Microsoft 365 Outage of November 12, 2026

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AI Fusion Summary

Microsoft’s massive outage on November 12, 2026, was the largest of the year, according to DownDetector. The Microsoft 365 disruption stemmed from Exchange Online servers unexpectedly failing automated health checks, causing a cascade of overload on remaining servers. Microsoft reported no malicious activity and has not yet released a post‑incident review, leaving the exact trigger unknown.
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