The software giant said it was working on a fix for the issue, which has affected the many companies that use Microsoft’s products. It later said it had fixed all affected services except Outlook on the web.

Microsoft said Monday it was investigating outages impacting its Microsoft 365 service, with thousands of users reporting issues with their Outlook, Exchange or Teams features. Microsoft 365 confirmed early Monday it was looking into an “issue impacting users attempting to access Exchange Online or functionality within Microsoft Teams calendar.