Microsoft 365 Crawls Back to Life After a 24-Hour Outage
Microsoft 365 outage affecting 70+ countries caused by bad network update, not cyberattack.
Microsoft 365 services experienced a widespread 24-hour outage affecting tens of millions of users across more than 70 countries, starting Thursday afternoon ET. The company attributed the incident to a technical issue during a network capacity upgrade and recent network change, explicitly ruling out cyberattacks or AI involvement. Microsoft increased email queue times to 48 hours to ensure message delivery and promised a full post-incident report once systems fully recovered.
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The lesson from this incident
Full lessonA network capacity upgrade and recent configuration change caused a 24-hour global outage of Microsoft 365, impacting tens of millions of users across more than 70 countries. The root cause highlights how infrastructure changes — even those unrelated to security attacks — can cascade into major service disruptions when change management and rollback procedures are insufficient. Organizations relying on cloud-hosted productivity suites are reminded that upstream provider outages can paralyze their own operations without warning. This underscores the importance of business continuity planning that accounts for prolonged third-party service unavailability.
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