[jamess]

Not to mention that the average hacker is usually far better equipped to manage a Unix flavoured server than a Windows server. With small companies who can't afford to have a full time sysadmin on staff, what you know is a powerful motivator. Windows server administration simply isn't the type of thing you pick up while using Windows, while the basics of managing Unixen is something you pick up while using Unix boxes.

[ScottWhigham]

I'm sorry but I don't see any difference in learning *nix admin vs Windows admin. If anything I think it's the opposite: Windows admin is much, much easier to learn. Where MS excelled early on was in usability and less-training-required - that was kind of the whole point.