Microsoft 365 users may be having issues signing into their email accounts Monday morning. Microsoft is investigating the issue with Exchange and Outlook and is posting updates on its X account since about 4 a.m. MT.

Microsoft 365 users are experiencing issues on Monday with the free email service Outlook. Users began reporting that outage just before 8 a.m. ET, according to Downdetector. It appears most people are reporting problems when trying to use the website version.

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