Azure West US Outage — 23 July 2026: A Maintenance Bug Severed IP Routes for Five Hours, Taking Down AKS, PostgreSQL, ExpressRoute and Teams for UK Businesses
Between 14:44 and 19:41 UTC on 23 July 2026, a bug in Microsoft's request conversion system removed IP routes from more network devices than intended during routine maintenance in the Azure West US region — taking down AKS, PostgreSQL, Databricks, ExpressRoute, VPN Gateway and Microsoft Sentinel for nearly five hours, with the cascade reaching Teams, Outlook and SharePoint globally. For UK businesses running Azure workloads, this is a case study in why cloud resilience architecture — multi-region failover, availability zones, and a managed Azure partner — is not optional.














