Microsoft Outlook users across the US are reporting widespread problems Monday morning, with thousands unable to access emails as Microsoft investigates an authentication issue affecting Exchange Online.
The outage began around 8 a.m. PT on August 31, with users reporting that Outlook was not working properly across both the website and app.
At around 8:17 a.m. PT, Downdetector recorded more than 6,000 reports of problems with Outlook, signaling a major spike in disruptions.
The reports were spread across the US, with users describing problems ranging from missing incoming emails to difficulties opening Outlook and accessing their accounts.
Microsoft confirms Outlook outage
Microsoft acknowledged the disruption through its official Microsoft 365 Status account on X, saying it had identified an issue with an authentication component.
“We’ve identified an issue with an authentication component which is contributing to impact,” Microsoft said.
The company said engineers had already developed a remediation strategy and were testing it on a portion of its infrastructure.
Microsoft said the fix would be rolled out more broadly after engineers confirmed that it was resolving the problem.
