Final Version Released - Topic Locked:
I've just posted a test version of Sunbird Portable 0.5 for folks to try out. This version updates to 0.5, has a streamlined launcher (removes code that is no longer necessary), and is packaged in a PortableApps.com Installer that will handle upgrades from 0.3.1.
Please give it a try and post any feedback.
(may take a few minutes to hit all download servers)