Microsoft Exchange Online outage causes email failures
π οΈ Microsoft is investigating a widespread service issue causing authentication errors and email delays or failures for Exchange Online customers. The incident (EX1464935) was first acknowledged at 5:30 PM UTC after a surge of user reports; Downdetector indicates tens of thousands affected. Reported symptoms include delayed or failed message delivery, authentication errors, administration access issues, and intermittent mailbox operation failures. Microsoft says it has isolated a common failure pattern tied to authentication and protocol connectivity and is analyzing telemetry to determine remediation and scope.
