MICROSOFT MAY well have signed a deal to disclose the secrets of its Windows operating system to mainland China, but that has prompted discussion about a statement Microsoft senior VP Jim Alchin made in the US antitrust last May.
He said under oath then that disclosing Windows code might compromise US national security, and, according to post on LawMeme, might even jeapordise the US war effort.

So people are asking why, if Microsoft is prepared to show the code to the Chinese, it couldn't possibly show such code to its own country.
China is believed to already have quite a chunk of US technology, and sources claim it not only has an Alpha-class chip, but its battle systems deliberately don't use Windows battle software, but a secure Unix/Linux derivative.