A Microsoft 365 outage that began on November 12, 2026, at approximately 16:17 UTC disrupted email, video conferencing, storage and artificial intelligence services for more than 12 hours. The incident affected users in 74 countries and territories, with Downdetector recording more than 130,000 Outlook-related complaints in the United States alone. Banks, governments, courts and airlines experienced disruptions, with some institutions using fax machines to confirm trades. Microsoft ruled out a cyberattack and attributed the incident to unexpected server unavailability, which placed additional strain on the remaining infrastructure. OpenAI and Anthropic also reported operational difficulties, while full service restoration had not been completed by November 13.
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