So, what are they so vulnerable from again? I haven't even heard MS mention ReactOS in a long time (if at all, my memory fails me).
As far as whether anyone and who was hired at Microsoft, your word is as good as mine until either of us gets some evidence. I'm not going to argue the point.
Edit: Paradox Uncreated, maybe you should go to [H]ardForum, where they care (maybe a little too much) about performance, and see if their reaction is any different. Call it a social studies experiment, if you will; the results may surprise you.