Quite happy to chip in to any Linux "corner". Spent best part of 10 years implementing open source solutions before ascending to management and would always recommend it for server solutions over Windows Server (which is pretty much a contradiction in terms).
It's amazing how companies start raising eyebrows when you point out they could easily surive with 2 good Linux techs @ £40k each instead of 8 average Windows grunts @ £20k each.