Apple doesn't really care about enterprise customers - at least they don't deliberately target them as customers. IBM wants to expand their services, and providing service that allows companies to use Apple products is a niche no one else is filling. Anyone can do that for Windows PCs since Microsoft provides all the tools.
IBM is trying to encourage Apple adoption by making some of their tools public which will be good enough for small companies, but they will keep some of it to themselves so they are the go to for any large organizations that want to take the plunge.
Biting the hand that feeds IT
