I thought this trend was interesting (assuming IDC got it right), I was not aware that Microsoft has 70% of the server markets and Linux markes may be shrinking
http://www.eweek.com/article2/0,1759,2207368,00.asp
"The annual rate at which Linux is growing in the x86 server space has fallen from around 53 percent in 2003, when Windows Server growth was in the mid-20 percent range, to a negative 4 percent growth in calendar year 2006, IDC Quarterly Server Tracker figures show."
“In 2000, Windows comprised about half of the server operating system market, followed by Unix and Netware at about 17 percent each and Linux reaching towards 10 percent, she said, noting that today Windows owns about 70 percent, Linux about 20 percent, with Unix below 10 percent and Netware barely registering.”