Juha-Matti dropped us a note to say that although the 1.5.0.5 version of Thunderbird (which fixes the Thunderbird vulnerabilities discussed here is not available on the Thunderbird web site it is available at this mirror site.

Update: (2006-07-28 19:50 UTC) 1.5.0.5 is now available at the main site above and will be automatically downloaded if you choose the "check for updates" from the Help menu.