Hmm, I always thought MS was founded to steal/modify MS DOS. Interesting that they briefly did Unix stuff, but I still take issue with the way op phrased it. "Their Unix roots" makes it sound like they were heavily invested in Unix and carried that forward even into windows. I don't know if they used any of that code in windows, but if they did you'd never know it by using dos or any windows version I've seen. Even despite both having command line interfaces, almost everything is different from Unix except the command "cd", to my recollection.