Microsoft Outlook outage: botched rollout spiked CPU, triggered cascading rack failures
tomwarren · x · 2026-11-13
Microsoft is battling a major Outlook outage reportedly caused by a rollout that spiked server CPU usage, forcing racks into maintenance mode and cascading into wider failures. Microsoft confirmed an overwhelmed core process caused capacity loss and is isolating infrastructure, restarting components, and gradually reintroducing traffic (EX1550543 / MO1550821).
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