Microsoft 365 outage hit email and security visibility
Microsoft said Thursday that an outage disrupted Outlook and could affect five other Microsoft 365 services, including Exchange Online, Teams, SharePoint Online, Copilot and Defender XDR.
Many servers became unavailable after failing automated health checks, leaving the remaining servers to carry the load. Microsoft said overall traffic had not increased; it is investigating elevated processor use and testing a workaround that bypasses the health-check component. The trigger remains unknown, and Microsoft has disclosed no evidence of a cyberattack.
For organizations relying on Microsoft 365, a shared service failure can interrupt routine communications and security visibility during the same incident. The reports do not establish that every tenant lost access to Defender XDR or the other affected services.
Massive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwide
Microsoft is investigating a widespread outage affecting multiple Microsoft 365 services, including Outlook, Microsoft Teams, and Copilot, as users report connectivity problems worldwide.