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 said it is assessing "an issue impacting users attempting to us Exchange Online or functionality within Microsoft Teams calendar."

Thousands of Microsoft 365 customers worldwide reported having issues with services like Outlook and Teams on Monday. In social media posts and comments on platforms like

( NewsNation) — More than 8,000 users reported issues with Microsoft Outlook’s email services in the past 24 hours, according to Downdetector. The software giant posted on X that it was deploying a fix. The outage-monitoring website showed about 8,700 reports citing issues with Outlook as of noon CT on Monday.

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

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

The outage was another jarring reminder that the move to cloud services increases dependence on outside vendors that periodically fail to function. While security experts have lon

S ome office workers who rely on Microsoft Outlook and related productivity apps like Teams were discovered that those programs were taken down by outages early Monday. Reports of

Microsoft said most Outlook and Teams services had been restored as of Monday evening, after more than 24 hours of technical delays.