Quoted on Baselinemag.com:

Scott Charney, chief strategist for Microsoft's Trustworthy Computing plan, says the ultimate goal is better initial software. "We have a large installed base with software that was not designed with today's threat model in mind," he says. "You have to have R&D, coding, testing, getting software into market, adoption--it takes time."

Well guess what, Scott - UNIX/Linux IS designed with today's "threat model" in mind. You've just hung yourself with your own spin-doctoring tongue.