Microsoft cloud service disruptions affecting Microsoft 365, Exchange Online, and Windows Update/Store

Microsoft reported multiple service-impacting incidents across its cloud ecosystem. Administrators in North America and Canada experienced an outage and degraded performance in the Microsoft 365 admin center, with some users also unable to access the M365 app or raise support tickets; Microsoft said it was analyzing telemetry, usage patterns, and CPU utilization, and reviewing user-provided HAR files to isolate the root cause.

Separately, Exchange Online quarantined legitimate messages after an updated URL rule incorrectly marked some URLs as phishing, disrupting email flow for affected customers while Microsoft worked to release quarantined mail and unblock legitimate URLs. In another disruption, Microsoft attributed Windows Update and Microsoft Store failures/timeouts (notably impacting Windows 11 users) to a utility power interruption at a West US datacenter, which cascaded into issues with Azure storage clusters supporting content delivery; backup power engaged and power was later stabilized, but service recovery required additional remediation beyond restoring electricity.