Comparing Unix to Windows 2003

I have a presentation to give at work on the comparison of Windows 2003 ( advanced server edition) and Unix.  
Any helpful insights or links to web pages comparing the two would be most appreciated.  I am technically challenged when it comes to all flavors of UNIX.
Who is Participating?

If you are also considering linux check this:

If you will use it as a File Server as well, check this:

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