On November 13, Microsoft fell over 3% in Pre-Market Trading. The main catalyst in focus is a multi-hour disruption across Microsoft 365 services. The outage affected Outlook, Teams, Exchange Online and some Copilot-related functions, with reports indicating the incident lasted more than five hours and impacted thousands of users across multiple regions.
Reported outage complaints for Outlook in the US peaked at about 138,058 before easing later in the day. Microsoft said the issue was tied to unexpected server unavailability that caused load imbalances rather than a traffic surge, added that remediation steps to improve service capacity did not work as expected, and said it had paused deployments, rerouted traffic, and restarted affected servers. The company also stated it found no evidence of malicious activity. The disruption further affected Microsoft 365 connectors used by OpenAI and Anthropic, extending the operational impact beyond Microsoft’s own applications.
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