If you use the Kindle app and plan to upgrade to iOS 7, you should install this update
Amazon has pushed a new update to its Kindle ebook app for iPhone and iPad that addresses an issue where users upgrading to the upcoming iOS 7 release might lose their downloaded ebooks.
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http://feeds.iphonehacks.com/~r/iphonehacks/~3/FZz2SRq4_-g/kindle-ios-app-required-update-for-ios-7.html