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Microsoft blames massive Microsoft 365 outage on maintenance bug
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Fusion42 · 24 July 2026 · Fusion42 review
Microsoft's automated maintenance system contained a bug that incorrectly removed IP routes from multiple devices in its West US datacenter, causing a 3-hour outage affecting Microsoft 365, Azure, Teams, SharePoint, and dependent services. The company has initiated a full review of its safety checks and automated maintenance processes.
This Wire brief sits within Fusion42's coverage of Enterprise Software, and 5 sources have reported it between 24 Jul 2026 and 25 Jul 2026.
◆ ◆ The Wire takeaway
Your business just saw what happens when the company that runs your cloud has a bug in its own maintenance system. If you're built on Azure or Microsoft 365, you now have three hours of real-world data showing what your disaster recovery plan actually needs to cover - and most companies don't have one that accounts for a Microsoft-wide outage.
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5 sources · first reported 24 Jul 2026 · latest 25 Jul 2026
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