I've just posted a pre-release of Thunderbird Portable 184.108.40.206. The new features are:
In-Place Upgrades - Thunderbird Portable now supports the ability to do what I'm calling an "in-place upgrade". This means that you can extract it right over an existing installation of Thunderbird Portable without losing any of your existing data and it'll Just Work (tm).
Live CD Support - Thunderbird Portable 220.127.116.11 now has built in support for running from a CD or other read-only medium (aka Thunderbird Portable Live). You just need to grab the INI from the Other\ThunderbirdPortableSource and drop it next to ThunderbirdPortable.exe. Edit it and set RunLocally to true. Just be sure to run ThunderbirdPortable.exe at least once BEFORE setting both these options so that it correctly sets up a default profile. Your thunderbird, profile, registry, gpg and plugins directories will be copied to the local machine's temp directory and Thunderbird Portable will execute from there. When you exit, all the temp files will be cleaned up.
Partial Update Support Fixed - I've fixed the partial update issue. Same as with Firefox, it was due to the Uninstall directory missing.
Guest/Limited Account Fixed - I've added detection and support for Guest and Limited Accounts so that the error about not being able to import into the registry will no longer appear.
Unread Email / Account Name Fix - I've added a fix that will allow Thunderbird Portable to clean up the additions Thunderbird makes to the registry within the UnreadMail section. This will prevent it from leaving behing an unread email message count that can't be fixed and leaving your account name (which some use their email address for) in the registry.
I think that's about everything. Please get some testing in on this ASAP as I'd like to push this release out for the world
You can grab the self-extractor here:
Thunderbird Portable 18.104.22.168 (en-us) Pre-Release
(Please don't mention this release outside these forums as it is for testers only
and not intended as a wide-scale release.)
UPDATE: A new launcher has been released that internalizes the default registry settings... so even if you lose the thunderbird_portable.reg file, it will work as expected. Grab a copy of the new launcher (Thunderbird Portable Launcher 22.214.171.124) and drop it into the ThunderbirdPortable folder.