A massive global service Microsoft outage struck Microsoft’s core enterprise services, causing widespread disruption. Essential business tools such as email and AI services simultaneously went dark, heightening organizational confusion worldwide.
According to Microsoft, widespread connection failures began at 12 p.m. on the 12th (local time) across major services including Outlook, Teams, Copilot, and Microsoft 365. These platforms are heavily relied upon by businesses and public institutions for daily operations.
Downdetector, a service outage tracking website, reported approximately 138,000 user complaints around 1 p.m. in the United States alone. Users reported being unable to access email accounts or experiencing significant delays in sending and receiving messages. According to Reuters, the trucking firm Workhorse Group was forced to postpone its scheduled earnings release from the 12th to the 16th (local time) due to the technical failure.
Microsoft stated that “an unexpected failure across multiple servers increased system load.” In a later update issued around 5 p.m. that day, the company explained that investigations revealed an overload on the core processes of affected servers, causing them to stop responding and suffer processing capacity losses. Microsoft added that it halted all deployment operations, redirected traffic from the compromised infrastructure to alternative locations, and initiated server restarts to restore normal functions.
The fallout also impacted corporate artificial intelligence integrations. OpenAI and Anthropic announced they were investigating issues after disruptions occurred within their Microsoft connectors. Both companies have integrated their models into Microsoft’s enterprise tools to help businesses streamline their daily workflows.
Previously, Microsoft experienced a major global cloud service outage involving its Azure platform in October of last year.
