We have been having the same errors in my office, 30 computers or so. The few with outlook work fine. I believe a workaround is to edit the settings for each account in thunderbird and disable SSL for the incoming and outgoing server settings. I tried that a little while ago on a few computers and it seems to be working, however I do not like having zero security. Would be nice if Mozilla addressed this issue. (Or if godaddy updated their servers to be more future compatible). Whichever it is.