Moving profiles for the Thunderbird e-mail client is a pretty common task we have to do for support partners who get a new office computer, and use Thunderbird. Thankfully, unlike Microsoft Outlook, Thunderbird profiles are relatively easy to copy over between computers – thanks Mozilla!
Step 1 : Copying over your existing Thunderbird profile.
Thunderbird profiles are stored at : %APPDATA% \Thunderbird\Profiles\<Profile name>\