how many old versions should my app be compatible with? so far im thinking just iOS5, and iOS6, since I've read that close to 90% of all iOS users update their devices. and when iOS7 comes out, for future apps and versions should i let the app be backwards compatible with iOS5? given that the original iPad and iPhone 3G is going to be stuck with iOS5. does people know how the percentage of people using older devices? how long will i have to be able to support these older devices and OS?