Exchange Online outage: traffic still ~90% below normal after 6.5 hours, Microsoft struggling
kingslyj · x · 2026-11-13
Kentik's OTT data shows Exchange Online traffic still 90% below normal 6.5 hours into Microsoft's outage, which began around 17:35 UTC. No comparable drop appeared in Office 365, Teams, or SharePoint/OneDrive.
Microsoft's status update (EX1550543/MO1550821) admits servers returned to service become unresponsive again once they receive traffic. The company is analyzing diagnostics, limiting traffic types reaching affected infrastructure in some locations, and rebuilding a subset of servers with a previous configuration to test whether that prevents recurrence.
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