I've just posted a pre-release of Thunderbird Portable 2.0. In addition to updating to the 2.0 final release, this new package also introduces a new installer. It's a simplified version of the PortableApps.com Installer I'd mentioned earlier customized for TBP. This new installer should work standalone as well as through the PortableApps.com Menu both the 1.0/1.0.1 release and the current 1.0.2 test releases. It should also properly upgrade an existing Thunderbird Portable 1.5 installation, though we're going to need to have more people test this to be sure.
As this is the first public release of an NSIS-based PAF, I'd like to get all the folks test it that I can.
UPDATE - PRE-RELEASE 2 (April 20) - The package has been updated to pre-release 2. The 1st pre-release accidentally included talkback (which can't be done since it is closed source and it leaves files behind) and didn't properly clean up an empty directory. The launcher was also changed to use the Thunderbird icon rather than the standard PA icon. If you already upgraded to 2.0 Pre-Release 1, you'll need to delete your ThunderbirdPortable\App directory and all sub-directories before installing. Please give it a try.
UPDATE - PRE-RELEASE 2 DE (May 11) - The de packages has been (really) updated to pre-release 2. No additional Add-Ons, exactly the same profile as the en version! In the Installer and Launcher only the strings was translated, no additions (Marko Moeller)