Microsoft is investigating an issue with its Microsoft 365 service and its Teams app, with some users reporting to DownDetector that they are having problems using services such as Exchange and Outlook.

Microsoft said Monday that it has identified the cause of a major Outlook and Teams outage, and is deploying a fix to the problem.

Microsoft on Monday morning said it is investigating an issue impacting users attempting to access services including its Outlook email product. In a post on X, Microsoft wrote it is assessing "an issue impacting users attempting to use Exchange Online or functionality within Microsoft Teams calendar.

Thousands of people reported issues with Microsoft Outlook Monday morning, according to Downdetector. Reported issues with the Outlook website and app began to spike around 9 a.m. Monday. By 12:30 p.m.

Several Microsoft programs, including Outlook, Microsoft 365, and Teams, are experiencing outages, according to reports on Downdetector.

Thousands of Microsoft 365 customers worldwide reported having issues with services like Outlook and Teams on Monday.

Microsoft said it's working to restore many programs after an outage Monday, but said progress has been slower than expected.

In social media posts and comments on platforms like outage tracker Downdetector, some impacted said that they were having trouble seeing their emails, loading calendars or opening other Microsoft 365 applications such as Powerpoint.

Some Microsoft users are reporting issues with Outlook and other Microsoft 365 programs on Monday morning, according to the website Downdetector. User reports of Microsoft Outlook issues began around 8 a.

User reports on Downdetector show issues with Microsoft 365, Teams, Outlook, and the Microsoft Store began around 5 a.m. ET on Monday. In a series of posts to X, the Microsoft 365