Running OneNote for iPhone on an iPad results in a message telling you that an iPad version of the app is available. Unfortunately, there is no sign of it in Apple’s iTunes App Store. It might have been better if Microsoft had made the app a single universal one.
The missing iPad app will probably be resolved in a few days. However, more troubling is that the free OneNote for iPhone app now has a 500 note limitation. You have to pay $4.99 for an in-app purchase to get past the limit. I wonder if this is a wise move for Microsoft given the ability of other most established cloud notebook services and apps like Evernote and Springpad.