Serious question here; is it that much different in the US? At 'big whatever' I have been in the EU (besides, strangely enough(?), France), the 'IT guys' don't like Windows/MS and would not choose it if it was up to them. I see Ubuntu, BYOD Mac OS X, iOS for management and force-fed Windows (with a lot of complaining).
People working mostly on Excel (or other Office components) would pick Windows, but those are not 'the IT guys'?