I made my job. I was in charge of developing curricula for sales folk (technical stuff, like installing CD jukeboxes and all) and got stuck building a web site to do it, and needed a good scripting language and database, so went to talk to the Unix/Linux gurus where I work and got started on LAPP about 4 or 5 years ago.
We've since cannibalized lots of old NT servers that were becoming a bit long in the tooth. Machines that crashed once a week and lost data every other time were replaced by a single Linux box that does their work in it's spare CPU cycles.
There's still a lot of Windows folks around here, but honestly, the competency is moving to Unix / Linux, and leaving behind the "click and drool" boys on windows. I'd guess there are fewer than 4 or 5 good Windows developer / admin types where I work now, but dozens and dozens of unix types.