I don't recommend updating to Thunderbird 5
 

The new theme is a mess and it doesn't give you an option to use the old one.

If you do install it, just reinstall the old Thunderbird 3.1.11 and it will be fine. No need to uninstall 5.

http://www.filehippo.com/download_thunderbird/
http://releases.mozilla.org/pub/mozi...bird/releases/

Okay, I won't :pimp

I don't like the pull down to/cc/bcc setup they moved to on thunderbird 5