Users are asked to set up timezone and language at Office 365 Portal on their first use after the service resumed
Email forwarding setting was lost
Service gradually resumed starting from 23 March 8am.
The incident was first reported on 23 March 7am. And a solution was then applied on system side and it took a few hours to resume the service.
It’s further reported that forwarding settings of some user accounts could not be resumed. If you have set up forwarding in O365 Mail and didn’t receive emails in the expected mailbox recently, please examine your email setting and set up the forwarding address again whereas appropriate.