The allinone package that Apple provides (the imac) is easy to maintain, and get support for when required, we need a compact platform due to space constraints, and other allinones are not much cheaper. Apart from a good online support network, I also can waltz down the street if the problem is urgent enough, this cannot be overstated.

Drivers for the hardware provided by Apple are always a single package making deployment easy, what's more they update cautiously, and updates are easy to deploy, that just isn't the case with many other providers.

The possibility of Installing OSX IF required, is also appealing, and no other hardware vendor offers that, and it happens on occasion.

There is an aesthetic appeal to the machine itself that is hard to deny, Some may question the validity of such frivolity, but in my view, thinking that is selling your coworkers short, aesthetics are important in the work place.

We do that too. The new MacBook Air has replaced the Dell E4200 as our default notebook for Windows 7. It's similarly priced, even with Windows, and it has a lower defect rate, a much lower incidence of damage (metal vs plastic, mainly), and users like it more.