He's an idiot. I have a mixed environment of both opensource (CentOS/Gentoo) and Windows (2003/2008). They both have their advantages and disadvantages. Updates for Windows, generally awesome, updates for Linux, pain. Uptime of server, Windows - generally good, can go about 90 days on a single boot, but thats because of 3rd party software, a base MS system, well, Had one up for 183 days, had to turn it off because I decided to put in another hard drive. And the same goes for Linux. Windows setup/configure - easy, Linux - pain. But hey, alot of people like it because its whole lot cheaper. And PHP/Perl is alot easier to get going reliably on linux then windows. But these are just my experiences.
Those who are too smart to engage in politics are punished by being governed by those who are dumber. - Aristotle