> Another theory is that some component of the development environment to compile TrueCrypt requires XP
This seems unlikely: the screenshots in your link clearly show the source could be built on Windows 7. The trouble Xavier mentions is with the updates to VS2008 SP1, not Windows service packs.
This seems unlikely: the screenshots in your link clearly show the source could be built on Windows 7. The trouble Xavier mentions is with the updates to VS2008 SP1, not Windows service packs.