Portable Thunderbird is a fully functional package of Thunderbird optimized for use on a USB key drive. It has some specially-selected optimizations to make it perform faster and extend the life of your USB key as well as a specialized launcher that will allow most of your favorite extensions to work as you switch computers. It will also work from a CDRW drive (in packet mode), ZIP drives, external hard drives, some MP3 players, flash RAM cards and more (Note: It will not run from read-only media like a CD-R).

Homepage:http://portablethunderbird.mozdev.org/
Download:Thunderbird_Portable_1.5.0.7_en-us_PRERELEASE2.exe
File Size:7.3 MB