"Set up your existing email address" will not work. Thunderbird stopped working no outgoing no incoming. Deleted account then downloaded new Thunderbird. Entering correct name, correct email address and password (also tried with no password) finds set up on Mozilla ISP sever. Select 'Done' brings up message "Cannot log in to server. Probably wrong configuration, username or password". This unsolvable for me now as I have tried everything I know and suggested in Help.

The above problem is copied from 1 year ago, now I have exactly the same problem again. Thunderbird suddenly stopped working. It would open but nothing shows on Inbox Sent or files etc. I have tried everything suggested. but nothing works. Have deleted everything Thunderbird and re downloaded Thunderbird Selecting the app shows that Thunderbird is 28.1.0esr (64-bit) version. I am now at a total loss to get Thunderbird back in operation.