It seems that not all is well between Microsoft and Apple (what's new), as it seems that there is a disagreement between both companies on the amount of money that Apple should get from each SkyDrive purchase made over their device, whether it is using the official SkyDrive app, or through integration with 3rd party apps. Basically, Apple is asking for 30% with a similar policy that Dropbox "suffered" from, which eventually saw Dropbox remove all methods for an iOS user to pick up extra storage.
Ubergizmo , Microsoft And Apple Tussle Over Skydrive Revenue, Microsoft And Apple Tussle Over Skydrive Revenue