Microsoft 365 outage of November 2026 was an engineering failure, not an attack

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A Microsoft 365 disruption on 12 November 2026 hit Outlook, Exchange Online, Teams, SharePoint and Copilot, and Microsoft Defender XDR was also listed among the affected services. Microsoft attributed the failure to a problem introduced during an earlier network capacity upgrade that surfaced after a later network change, and said it found no sign of malicious activity. Servers failed automated health checks, the remaining machines were overloaded, and restarted servers failed again as traffic returned. Service was restored over roughly two days, with Microsoft confirming full recovery on 14 November, and government operations in several countries were affected. Public reporting does not yet establish whether security detection continued running during the incident, and the root cause remains preliminary.

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