Schneier is skeptical on NSA 'helping' Microsoft secure Vista

I don't trust Microsoft to run my laptop, should I trust it after NSA has jumped in to help it improve Vista?
Bruce Schneier is suspicious: has NSA effectively made Vista more secure or has it injected its own backdoors for later use?

Was there a prior relationship among the two:
http://www.answers.com/topic/nsakey

http://www.schneier.com/crypto-gram-9909.html#NSAKeyinMicrosoftCryptoAPI

http://www.wired.com/news/technology/0,1282,21577,00.html