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.

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