Users have reported yesterday for Outlook is down.
“We’re investigating an issue in which some users may be unable to access Outlook and OneNote. Additional information can be found in the admin center under OC186848 and OL186847 or at http://status.office.com ,” says a message issued by the Microsoft 365 Status Twitter account.
Microsoft 365’s team is currently working on fixing the problems impacting Outlook, OneNote, and OneDrive users by “rerouting traffic to mitigate impact.”
We’ve rerouted traffic and our telemetry indicates that the service has largely recovered; however, some users may still be impacted. We’re performing targeted component restarts to fully remediate the issue.
Update 18:53 EDT: The Microsoft 365 Service health status page and the Microsoft 365 Status Twitter account state that the Outlook, OneNote, and OneDrive issues have been mitigated: