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.
* Thunderbird updated to 188.8.131.52
* Slight name change to Mozilla Thunderbird, Portable Edition
Internet and communication
Product page: here