Microsoft balks at Apple’s 30% fee, leaving SkyDrive and apps that integrate with it in the lurch on iOS - The Next Web

Check the full article for some allegedly dubious Apple merchant modus operandi

"Microsoft does not appear keen to pay Apple the 30% cut, as it lasts in perpetuity, regardless of whether a user continues to use an iOS device or not, as the billing is through their Apple account.
Therefore, if a user signed up for a few additional gigabytes on their iOS device, and then moved to Android or Windows Phone or not phone at all, for the length of their account, Apple would collect 30% of their fee for storage. This hasn’t sat well with Microsoft."

Microsoft balks at Apple’s 30% fee, leaving SkyDrive and apps that integrate with it in the lurch on iOS - The Next Web