Microsoft 365 is experiencing an outage. Here's what to know.

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.

On social media service X, Microsoft posted a message early Monday that it is assessing "an issue impacting users attempting to access Exchange Online or functionality within Microsoft Teams calendar." The problem appears to be affecting Microsoft users globally, according to posts from users.

"We've identified a recent change which we believe has resulted in impact. We've started to revert the change and are investigating what additional actions are required to mitigate the issue," Microsoft added in a subsequent post.