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 most Outlook and Teams services had been restored as of Monday evening, after facing a day full of technical delays.

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.