Microsoft 365 and Outlook Suffer Global Exchange Online Outage Affecting Mailbox Access
What happened
Microsoft 365 suffered an extensive service disruption on November 12, 2026, knocking out Outlook mailbox connectivity alongside Teams, SharePoint, and Copilot across multiple regions.
The Context
* Infrastructure dropped offline unexpectedly: Rather than an external traffic surge, Microsoft traced the root cause to internal servers becoming suddenly unavailable, triggering elevated operational loads across its Exchange Online architecture. * The Americas felt it first: Problems began surfacing around 10:40 a.m. ET with North American Teams disruptions before expanding globally under incident EX1550543 by 12:54 p.m. ET. * Mitigation required manual intervention: Engineers paused pending software deployments, redistributed live network traffic, and initiated selective server reboots to stabilize enterprise access.
The Number
— The peak number of user-reported Outlook disruptions recorded on Downdetector within a single hour, signaling immediate operational friction for distributed global teams relying on synchronized communications.
Takeaway
As Microsoft works through infrastructure reboots without a published completion timeline, enterprise operators should expect rolling latency and monitor the Microsoft 365 admin center for verified restoration milestones.
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