Hey, wow, I never thought of that. I am using Dropbox to sync my documents and all kind of stuff between computers. Also some configs. But not anything mail related, as it's anyways on imap (or gmail for some).

How would you setup that? Is that even supported by Thunderbird?

Have you tried portable thunderbird(from portableapps.com) ? My way of doing what you described has been to setup thunderbird on one machine and then sync it on the network through syncthing and am quite happy with this setup. Another option would be to change the default path where the profile is saved, but the portable variant is much more cleaner IMO.

Yea this is possible. I can’t remember exactly how but I installed Dropbox on both computers and put the Thunderbird profile in there. Iirc the profile directory was getting conflicting writes from each computer. But it ended up working somehow.