Rupanya sudo apt-get install mozilla-thunderbird di feisty memasang thunderbird versi 1. Ya sudah, karena pengen install versi 2. Maka uninstall dulu…
Buka synaptic, mark thunderbird for uninstallation 
Proses uninstall…
Download Thunderbird 2 dari website mozilla (Save to disk)
sudo tar -C /opt -zxvf ~/Desktop/thunderbird-*
sudo ln -s /opt/thunderbird/thunderbird /usr/local/bin/thunderbird
bikin shortcut : sudo gedit /usr/share/applications/thunderbird.desktop
[Desktop Entry]
Encoding=UTF-8
Name=Thunderbird
Comment=Thunderbird Mail Client
Exec=thunderbird
Icon=/opt/thunderbird/icons/mozicon16.xpm
StartupNotify=true
Terminal=false
Type=Application
Categories=Applications;Network
Benerin shortcut
Pindahkan data email versi sebelumnya ke ~/.thunderbird
Done
