Sending, receiving, and organizing email in Outlook.com
Hi, I'm Thileep. I'm happy to help you!
It appears that multiple users are experiencing the same issue with Outlook. Microsoft is aware of the problem, and you can check the current service status here:
https://portal.office.com/servicestatus/
At this point, we recommend waiting for Microsoft to resolve the issue on their end.
Best regards,
Thileep