Mozilla Thunderbird, Portable Edition

Mozilla Thunderbird®, Portable Edition is the popular Mozilla Thunderbird email client bundled with a PortableApps.com launcher as a portable app, so you can take your email, address book and account settings with you. You can also add in GPG and Enigmail to encrypt and sign your email.

download di sini:
http://portableapps.com/apps/internet/thunderbird_portable