 On October 12, 2011, iOS 5 was released to various iOS devices, including the first-generation iPad, and was downloadable through iTunes.The update was reported to contain hundreds of new features and tweaks, including Twitter integration, Notification Center and iMessage, which is a feature that allows users to send messages or multimedia files to other users on iOS or OS X, the operating system for Apple computers.iCloud, an iOS app and Apple-provided internet storage service which allows users to sync and backup their user data and settings to/from other devices, was also made available through this update.