A major global outage hit Microsoft 365, with connectivity problems affecting email and other services from the early hours of the 13th Japan time. Microsoft said it had found no evidence suggesting a cyberattack.
A major outage has affected Microsoft 365, Microsoft's business software suite, since the early hours of the 13th Japan time. Email software connectivity failures, including in Japan and other regions worldwide, have disrupted business operations. Some services have been restored, but the impact remains widespread.
The Japanese subsidiary's public relations team said it had found no evidence suggesting a cyberattack. The outage has spread across multiple business applications, including Outlook, leaving several services unstable. Microsoft is progressively disclosing the scope of the impact through its official announcements and status page.
In Japan, reports of problems with email and Microsoft 365 surged after 4 a.m., with more than 3,000 reports confirmed for Outlook alone. In the U.S., reports of Outlook problems reportedly reached approximately 130,000 at the peak. The outage affected multiple services, including Teams, Exchange, Copilot, SharePoint and Defender XDR.
The company said the outage was caused by multiple servers becoming unexpectedly unavailable, concentrating the load on the remaining infrastructure. Some partial recovery has been seen, including the resumption of normal operations on certain servers, but no timetable for full restoration has been provided.