Microsoft 365 Down — March 16, 2026 Outage Report

majorResolved

Microsoft 365 services including Outlook, Teams, and OneDrive were severely degraded for 5 hours during business hours.

Started March 16, 2026 at 7:00 AMResolved March 16, 2026 at 12:00 PMDuration: 5h

Affected regions: Global

Incident Timeline

InvestigatingMarch 16, 2026 at 7:00 AM

We are investigating access issues with Microsoft 365 services.

IdentifiedMarch 16, 2026 at 7:45 AM

Authentication service degradation causing sign-in failures across M365.

MonitoringMarch 16, 2026 at 10:00 AM

Authentication services recovering. Some users may still experience issues.

ResolvedMarch 16, 2026 at 12:00 PM

All Microsoft 365 services restored.

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