Domain, unified administration and local services (printer and network is a must) and server.
While Apple is doing somethat well for stand alone server (or you could say, a sub $3000 server) but they don't care about a workstation, cause OSX lack on specification and hardware lack on power and toughness.
Apple lives in a small and tiny bubble, instead the enterprise market is hugest and can't fit into this small space.
In opposite, currently IBM lives almost exclusively inside the enterprise market.
The awful truth: Apple is for retail, in the same degreed than Sony (computer) is for retail. Apple dreams with blade server but
