:: download thunderbird 3.1.10 email client

or you can download on thunderbird download page

:: installing thunderbird from source on linux

:: open / running thunderbird 3.1.10

:: add thunderbird shortcut on gnome-panel

0. right-click gnome panel and select Add to Panel..
1. select Custom Application Launcher..
2. add value on Add Louncher, like:
Type: Aplication
Name: thunderbird
Command: /usr/local/thunderbird/thunderbird
3. click OK button

:: links
+ google
+ thunderbird