well.. in the end.. 1000 ppl studied, not really enough to validate it and no source quoted again reducing its credibility. If they'd asked me, someone who has administered both windows and linux networks, large and small, its pretty clear which way I lean and not just for the cost factor.
Im not trying to bash windows and yes I do use it still on one of the desktops. I actually have 3 desktops all up one for each, mac, linux and windows and I probably use the mac and windows more out of the 3. see more Server wise however I just cant see it.