[unsignedint]

It looks like TrueCrypt and BitLocker has been trying to solve a different type of problem.

BitLocker is somewhat more business oriented -- thus they feature things like key recovery, more protection (or might be taken as limitation to some) when the hard drive is removed from one computer and ported to another machine, etc.

TrueCrypt seemed to be aimed more toward security than manageability, lacked those features above, which might have aligned with user demographies that these "business" requirements either they didn't want to have or not relevant.