Microsoft 365 Outage Disrupts Email, Web Meetings and AI Service Connectors
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- ITmedia.co.jp
On November 13, Japan time, a major communications outage affected Microsoft 365, Microsoft Outlook and Microsoft Teams, disrupting email, web meetings and other services for users. Reuters reported that the disruption had lasted for several hours. Microsoft said it was working to restore affected servers and that some recovery was visible as users began reconnecting. Downdetector reports for Outlook peaked at 138,058 around 3 a.m. and later fell to about 34,490; Microsoft 365 reports had declined to about 13,000 before 8 a.m., while Teams access reports stood at 763.
Microsoft said the cause was not increased traffic, but multiple servers that unexpectedly became unavailable under high load. The incident also affected connectors linking the business tools with AI services from OpenAI and Anthropic. OpenAI said it was investigating possible failures in new connections through Microsoft connectors and tools not working as expected. Anthropic said it had identified an issue at the connected service provider affecting its Microsoft 365 connector. The outage highlights how disruptions to a widely used cloud productivity suite can also affect connected services.
Microsoft said restored servers were stable so far, traffic was being rerouted where possible, and recovery procedures for affected servers were being streamlined. The company said services could recover gradually as capacity returned and user clients reconnected. The final restoration status and the full duration of the outage were not disclosed. Microsoft had also reported a Microsoft Azure outage in October, making the November incident its second consecutive month with a reported service disruption.
Original report
[ITmedia ビジネスオンライン] 「Microsoft 365」で大規模障害、メールやWeb会議に影響 原因と復旧状況は？
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