Does it really matter what cloud services Apple uses? Yes, they have their own data centers but why should it be surprising if they also utilize others as well?

Microsoft is, in many ways, lots of little companies that all live together. If the Azure business unit makes money from Apple, it doesn't really matter if the Windows Live teams are failing in their products.

The oft-mentioned great thing about cloud services is not having to worry about managing hardware. Leave that to the people that are really good at it, and build your business on top.