Comment If you think Linux doesn't have tech support costs (Score 2, Insightful) 249
Then you've never worked in an enterprise environment that uses it. You'll have a ton of tech support and maintenance costs with Linux. You not only have all the regular user shit, people who can't figure out how to use their computer, administrative stuff, etc. However I've also observed that a good bit of the stuff in Linux requires a lot of sysadmin work, scripting and such. We do Linux and Windows in our environment and we certainly make Linux work on a large enterprise scale, but our Linux lead spends an awful lot of time messing with puppet, shell scripts, and so on to make it all happen. A lot more than we spend with AD and group policy to make similar things happen in Windows.
Licensing savings are certainly something you can talk about savings for, however you aren't getting out of support and maintenance. That is just part of running an enterprise. The question is what would their costs be, compared to Windows? that is likely to vary per environment.