I don't know the correct terminology to describe my question. Extensive searching with various wording in several places gives answers to other questions. I have the same Thunderbird Mail account on two Linux computers. I can read and write messages from different email accounts on both devices and other mail clients with no problem. Changes made in one place are reflected everywhere else I have the same account. What I want to know is if I can have a new account added to Tbird on one computer automatically added to the other one. When I upgraded the OS on my desktop computer and installed Thunderbird, and signed in with my profile details, the left pane was empty. In order to start using it, I had to manually add each email account as if for the first time. I had thought that the information in the Tbird app on my laptop (same profile) would sync with the other computer, but it seems that's not what synchronize means. I've added a Blogs and Feeds folder to each of the computers, but when I add a new RSS Feed, it's only found on the computer I was using when I added it. Searching seems to suggest there is a way to do this with some complicated third-party mediation, but I use Thunderbird because it's simple to open any message right at my fingertips. Isn't there some way I can copy everything in my Thunderbird account from one computer to the other with just a few clicks?