But iOS is showing promise OS X hasn't in a long time in this fashion. Apple are providing the tools and features required by enterprises. They aren't level with RIM's BB platform yet, but I bet they will eventually get there.
It's pretty insane how many iOS devices are getting bought at our organisation - although they're pretty much used as glorified email readers and status symbols, bought by the wrong people, thrown at IT and expected to work.
My two biggest issues are:
-- I can't get proxy authentication to work reliably. Entering a fqdn into a popup box that appears 'at random' is hardly usable.
-- I can't buy applications and deploy them to devices. Apple's large account department sounded pretty ashamed when they suggested their solution; that every user has their own itunes account and we provide gift cards for them to buy applications...
This is the type of thing that might sound like a non-issue to some, and a completely unworkable mess to others - pretty much dependant on the size of the business, the services that are used to run it and security policies.
Realisticly, osx can do little more than sit on a corporate network as standalone machine currently. Unmanaged (compared to a windows desktop), running osx software, receiving no support and missing out on 10000s of man-hours worth of services already built to 'run the business'.
'Normal' people have computers at home and smart phones in their pocket, everything works very nicely, irrelevant of the OS - If you haven't worked in a large enterprise environment, it's pretty hard to imagine the transition.