On your old system, run:
Code:
tar czvf thunderbird_backup.tar.gz ~/.thunderbird
Then copy thunderbird_backup.tar.gz to a USB stick or whatever you're using to store your files during your reinstall.
On your new system, drop it into your home folder and run:
Code:
mv .thunderbird thunderbird_old
tar xvf thunderbird_backup.tar.gz
The mv command is only necessary if you've opened thunderbird already on the new machine, since we don't want any new settings to interfere with the old profile.
When you next start thunderbird you should get all your old stuff just like nothing's changed.
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