Sounds like FUD - There are things like NT4.5 which is NT built from university source copy of (as the name suggests) NT as it was somewhere between 4.x and 5.0.
But ReactOS is clean room, and like Wine, AFAIK actively bars from contributing people who had contact with MS source code - IIRC it also cooperates heavily with Wine on implementing things.
But ReactOS is clean room, and like Wine, AFAIK actively bars from contributing people who had contact with MS source code - IIRC it also cooperates heavily with Wine on implementing things.