I have my suspicions that the share of market by installations for windows given by IDC is not the real picture. Most of the places I have worked have Linux servers (sometimes hundreds) that are not 'registered' or paid-for subscriptions (e.g., like RHEL), and run Debian, CentOS, fedora etc. Do IDC have a good way of counting these? Sure, there are probably unregistered windows servers out there, but they are very likely to a small minority.
Looking at web servers, for instance, most run Apache, and my guess is most of those run Linux (some would run one of the BSDs or Solaris of course) but majority would probably be Linux. And I don't think the sysadmin job market reflects the market share numbers quoted.
So I would be cautious to accept these figures at face value...
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