Microsoft blames failed server health checks—not hackers—for global outage
Summary
A global Microsoft 365 outage began around midday Thursday and was still ongoing Friday morning, disrupting email, cloud, and AI services. Microsoft said failed automated server health checks made infrastructure unavailable and said it had no evidence of malicious activity; recovery work continued, including measures to preserve delayed email.Key Facts
- The outage affected Microsoft email, cloud, and AI services across multiple regions.
- Microsoft said a server problem caused automated health checks to fail, making servers unavailable.
- Microsoft said increased traffic did not cause the outage and that it had no evidence of malicious activity.
- Some servers became unresponsive again after they were returned to service and received traffic.
- Microsoft extended email timeouts to 48 hours to help preserve delayed messages.
- The outage disrupted work at businesses, hospitals, police departments, schools, and government offices.
- Some users could not make bank transfers because they could not receive verification codes.
- Microsoft said recovery actions were ongoing and that it would share a post-incident report after mitigation was complete.
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