Earlier quoted context omitted.
I think that's the point the comment you are replying to made: if it was legitimately a microsoft key that just serves a different purpose, it would be trivial for microsoft to prove it by just signing a message or anything with the corresponding private key. The fact that they haven't reinforces the argument that they don't own the private key (likely, the NSA does as the conspiracy goes)
> (likely, the NSA does as the conspiracy goes) Pardon my pedantry but I think you meant conspiracy theory . Conspiracies happen all the time, and by itself the word doesn't imply anything far-fetched or unproven, just plotting to do harm.
Maybe next time I'll write a paragraph shrugs
Time for me to find another community.