According to Downdetector, users in several major US cities were affected, including Minneapolis, Chicago, Los Angeles, Seattle, Atlanta, New York, Boston, Tampa and Washington.
Microsoft 365 services experienced an outage on Wednesday, with users reporting problems accessing Outlook and Teams. Thousands of disruption reports were logged on Downdetector, which monitors outages using user submissions. The site showed more than 4,000 reports related to Microsoft 365 at the height of the disruption.
According to Downdetector, users in several major US cities were affected, including Minneapolis, Chicago, Los Angeles, Seattle, Atlanta, New York, Boston, Tampa and Washington.
In a post on X (formerly Twitter), Microsoft said it was investigating the issue. “We’ve received reports and are investigating an issue affecting Microsoft 365 services, including Teams and Outlook. Further information can be found in the Microsoft 365 admin centre under MO1220495,” the company said.
Microsoft later added: “Our investigation indicates a possible third-party networking issue may be affecting access to Microsoft 365 services, including Teams and Outlook for some users.”
Downdetector data showed that reports of problems with Microsoft 365 declined to 77 by 22:44 ET, down from nearly 20,000 earlier in the day. For Microsoft Azure, reports fell to 230 by 18:49 ET, from a peak of more than 18,000.
Past Microsoft Outages
Microsoft had said in October last year that it had resolved an outage affecting its Azure cloud platform, which disrupted productivity software and services across multiple industries worldwide.
At the time, Microsoft Azure said: “While error rates and latency are back to pre-incident levels, a small number of customers may still be seeing issues, and we are still working to mitigate this long tail,” adding that the incident lasted for more than eight hours.
Earlier on Wednesday, Azure said customers using Azure Front Door — its global content and application delivery network — experienced timeouts and errors from around midday ET.