TCO

Last year Microsoft started it's "Get the facts" campaign about how Microsoft Windows Server was suppose to be less expensive than Linux. Microsoft cited studies which they originally claimed to be by an independent group, which turned out to be true, but sponsored by Microsoft, which means not so independent as Microsoft led people to believe.

Eweek has an interesting article about the cost of Linux:
http://www.eweek.com/article2/0,1759,1782587,00.asp

Here's my own simple TCO study: