Why do you need OSX instead of Linux/Unix servers?
Possibly because the upper level has stated they wish a single point of contact for for the server (hardware and OS)?
The above describes my issue. There are plenty of people involved in my organization that would just as soon pull every Macbook, iMac, iPod and iPad out of the field and replace them with Dell desktops, laptops and netbooks.
The offset argument used in the past (which secured a presence for Apple products) was the single point of contact via an Enterprise Applecare subscription.
Additionally (as has been mentioned earlier), emulating many of the services incorporated in OS X Server are a dubious proposition.
I'm not saying that they cannot be replaced, but the polish that Apple has provided is a selling point for the desktop (think Podcast Producer). Can SUS be recreated under Linux? Sure, but what if your employer isn't sold on homebrew services for something as important as software updates? What if AD is controlled by another department and refuses to extend AD and management has declared that OpenLDAP isn't allowed and you can't have the budget for Centrify?
Look, I'm not the Mac apologist here -- my background is as an independent consultant that is more accustomed to digging into FOSS projects for client solutions than recommending closed options; but when a client or employer tells you - "You cannot do that." That's that. You can petition, or slowly try to make a change; but rarely do you get to tell your boss, "Hey man, quit whining. Suck it up and toss some Linux on that box or deal with filling up the server room with 12U towers that aren't servers, loser."
You go that route, you wind up figuring out your next job before you planned on and (if you were right all along), they wind up pulling the platform once systems reach EOL instead of refreshing.
Some of you people kill me. "Well, I don't see a need for it, so quit complaining." And this from a crowd that generally wants to see more Macs in public spaces.
Wow.
Here's food for thought, many network admins feel the exact same way about even having a Mac on their network -- and many support level technicians feel the same way about having them on the desk. Your attitude is no different than theirs, so you shouldn't be too upset when someone comes along and tells you that you can't place your Apple branded device on the network at all.
Next on the hit list.......
- Final Cut
- Motion
- Color
- Logic
Basically, anything that falls in to the "professional category".
Final Cut and Logic are already threatened by the cancer of "It should be more mainstream and user friendly..." I thought that's why we had iMovie and Garageband...
My fear (as I've stated a few times today already), is that we're going to wind up with iPads, iPhones and Air's running a hybrid OS X/iOS and everything else can go away.
Which, I suppose, might actually make things easier in the long run.
I'm personally tired of this fight today. I've spent most of my waking hours since Friday trying to find solutions and now I've got to begin preparing actual suggested courses of action. Budget plans don't like ambiguity.