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Nov 12, 2026

Microsoft suffers major global outage hitting Outlook, Teams, and Copilot

A widespread Microsoft 365 outage disrupted Outlook, Teams, Copilot, and other services for thousands of users globally for more than five hours, also affecting connectors used by OpenAI's tools. Microsoft said it was working to restore services.

Nov 12, 2026·8 sources

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Top claims

▪Third-party AI providers OpenAI and Anthropic reported disruptions to their Microsoft 365 connectors and Claude for Outlook during the November 12, 2026 outage
▪Microsoft identified an overwhelmed authentication process and a recent network configuration change correlated with the start of the November 12, 2026 Microsoft 365 outage
▪The Microsoft outage that began November 12, 2026 forced financial trading desks in Australia, Singapore, Japan, and the United Kingdom to rely on phone calls, faxes, and WhatsApp chats to communicate and execute trades

Topics

Cloud Computing Microsoft Copilot OpenAI Microsoft Computing infrastructure Cloud operations

Related entities

Japan United Kingdom Singapore Australia United States