10.2 Apps that look similar to apps bundled on the iPhone, including the App Store, iTunes Store, and iBookstore, will be rejected. This may be as simple as th

10.2 Apps that look similar to apps bundled on the iPhone, including the App Store, iTunes Store, and iBookstore, will be rejected. This may be as simple as thinking their users don't know how to tell the real Mail.app from your 3rd-party Mail.app. If they can't tell the difference after installing yours, they may be confused or otherwise left behind when Apple updates Mail.app with some shiny new feature you don't have. If they're not sophisticated, they'll blame Apple, not the developer, for a lousy core functionality.