A nearly two-day global Microsoft 365 outage knocked out Outlook, Teams, and Copilot for millions of businesses, schools, hospitals, and police departments before Microsoft said services were fully restored. Microsoft apologized and said the cause was a technical issue from an 'earlier network capacity upgrade that surfaced following a recent network change,' not cyber or AI; recovery was gradual as the company drained queued mail and rebalanced traffic. It took roughly 36 hours to fully restore, and a report from Ookla and DownDetector found it was the largest outage of 2026 by user reports, with 7.4 million reports versus 2.8 million for a February YouTube outage, and one think tank estimated the cost at $7 billion. The Guardian reported that experts fear the disruption could cost Australia's economy billions and force some small businesses to close, while one user's account of the outage is a reminder that removing email for a day can reveal how much productivity is lost to constant inbox checking. The episode strengthens the case for resilience planning and for questioning single-vendor concentration in essential workflows.
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