Tens of thousands of users of Microsoft services experienced disruptions to Outlook, Teams and other applications. According to Downdetector, problems were recorded in 74 countries and regions.
The outage lasted more than 13 hours. The faults also affected the AI assistant Copilot and some components of Microsoft 365 used by companies to exchange data between applications.
In Japan, the problem affected the infrastructure of the government information system, the country's Cabinet Office reported.
Among those affected by the outage were also the AI companies OpenAI and Anthropic, Indian airlines and many others.
Microsoft said it was investigating reports from North and South America of problems accessing Exchange Online mailboxes. The company later warned that disruptions were also possible in other regions.
According to Microsoft, the services became unavailable because of increased load on the infrastructure in several regions. The company redirected data traffic to alternative routes, after which the systems gradually began to recover. As of the time of writing, Microsoft had not managed to fully resolve the faults.
