It’s not really that different. All OSes have basically the same stuff they’re trying to do: organize files, apply security, give applications access to the hardware, manage memory. And there’s still stuff to be done in Windows on the command line, just solved an issue on the MILs Windows 7 box from the command line last week.
OTH, If you are building high end SEVERS nothing but UNIX will do. The fact that a server would need a graphics card (windows) to interact with the system admin is a joke. we don't even get a graphics card in our unix servers. Useless waste of CPU.