Microsoft Outlook and Exchange Online outage traced to network capacity upgrade fault

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Exchange Online began failing for many users around 1 p.m. Eastern on November 12, 2026, leaving Outlook inboxes and calendars unavailable. Services including Teams, SharePoint Online, Microsoft 365 Copilot and Defender XDR were also degraded as the problem spread. Microsoft said the trigger was a fault from an earlier network capacity upgrade that a more recent network change exposed, causing servers to fail automated health checks and overloading the remaining machines. The company stated the incident was not a cyberattack and that it was not caused by a traffic surge, and it rolled back a recent network configuration change while staging server restarts. Microsoft said on November 14 that the underlying issue had been fixed and the last regions restored, though it has not yet published a post-incident report.

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