They don't give a shit if your an MCSE. They care about experience with past jobs.
Besides, some things on Windows I find personally, are way more difficult. I could never work out how to set up IIS 6.0 with dummy SSL cert, so if you want to secure site for simple personal reasons you would need to shell out hundreds to a CA.
Apache on the other hand has a great source of online documentation and its really easy to configure. Any monkey that can read can set it up. However their are things a monkey cannot do well, such as general Linux system maintainence. Sure you see a lot of monkeys running their own home webservers on their broadband/ADSL connections, but a lot of them go down time and time again.