Mozilla Connect

I have an office 365 account, not free. It's working very well.Outgoing Server (SMTP): Microsoft - smpt.office365.com (default) Port 587Connection Security (SMTP): STARTTLSAuthentification (SMTP): OAuth2=====Server Name: outlook.office365.com port 99...

It was still not working so I made the changes you propose, and it worked! Hopefully, it will last...

It stop working again this morning.... 

Yes, it works now... Microsoft is freaking out about something... 

Same problem, just started a few days ago. Outlook pop imap are not accepted by Thunderbird anymore.Microsoft activated a protection since the last virus attack on their server?