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iCloud is a cloud storage and cloud computing service from Apple Inc. launched on October 12, 2011. As of 2018, the service had an estimated 850 million users, up from 782 million users in 2016. iCloud enables users to store data such as documents, photos, and music on remote servers for download to iOS, macOS or Windows devices, to share and send data to other users, and to manage their Apple devices if lost or stolen. iCloud also provides the means to wirelessly back up iOS devices directly to iCloud, instead of being reliant on manual backups to a host Mac or Windows computer using iTunes. Service users are also able to share photos, music, and games instantly by linking accounts via AirDrop wireless. iCloud replaced Apple's MobileMe service, acting as a data syncing center for email, contacts, calendars, bookmarks, notes, reminders, iWork documents, photos, and other data. Apple has eleven company owned and operated data centers supporting iCloud services.