Microsoft Outlook and Teams Outage Lasts Over 12 Hours, Affecting Governments and Businesses in Multiple Countries

November 13 — According to Reuters, the service disruption to Microsoft Outlook and Teams has lasted more than 12 hours, and Copilot has also been affected. Microsoft said the failure was caused by a server issue and mainly affected functions that rely on Exchange Online. After a fix patch was rolled out, the system is gradually stabilizing, and Microsoft said it has found no evidence of malicious activity. Government agencies in Australia, Japan, the United States and the United Kingdom were affected, and the UK's NHS switched to alternatives such as paper records. The operations of companies including Euronext, Maersk, OpenAI and Anthropic were also disrupted. According to people familiar with the matter, a financial institution in Taiwan canceled a bond repurchase transaction. This is the second Microsoft 365 service disruption this year, and Microsoft shares fell 1.7% in premarket trading.