Fight back!
Don't let them windows-guys drag you down with them - argue your case, and make them use unix and apache.
The combination of *nix/apache/php/mysql is one of the most tested and reliable combinations of software there is.
Equally, there are loads and loads of cases on the net proving that windows is a bad choice when it comes to servers.
IMHO it's the other progs that have to justify their demand of windows as a platform, and you should at least try to look at the possibilities for switching them to the existing platform before you give in 😉
knutm