The M$ Server 2k3 use a group of hackers for IVQ purposes.
Just hope those guys are real whitehats ... & not kiddies

One person I have working for me actually used to be a hacker -- he's British -- and we persuaded him there was a career to be had. We took a whole bunch of these people and made them hackers. We had them hack the system. We took the people who were responsible for each component and we did design reviews and code reviews. We created a whole book of common coding problems that lead to security errors, and we took every piece of code in the system and compared them against those rules. We created tools that run across the code and understand almost all the attacks. Microsoft Research built a tool that can find almost all the buffer overflow problems, and compilers added a bunch of checking.
full article here ...