I use an older hotmail account with thunderbird and it works perfectly fine. I needed to set up a new account, but with the new outlook account I get the User authenticated but not connected. I found a few posts about this, but their fix does not work. disabling ipv6 in config editor I am using the defaults, port 993 OAuth2 SSL/TLS I have tried disabling ipv6 but that does not fix the problem. Don't know if Microsoft changed something with the newer accounts. Is there anything else I can do? the other posts I found about this were... https://support.mozilla.org/en-US/questions/1399126