iSync is a software program originally released by Apple Inc. on January 2, 2003. Apple has licensed the core fusionOne technology. It only ran on Mac OS X and was used to synchronize contact and calendar data from the address book and iCal with many mobile phones that are not compatible with Apple SyncML over a Bluetooth or USB connection. Support for many devices (pre-October 2007) was built-in, with new devices supported through third-party manufacturer and iSync plug-ins. Support for Palm OS organizers and compatible smartphones was removed with the release of iSync 3.1 and Mac OS X 10.6 Snow Leopard. BlackBerry OS, Palm OS, and Windows Mobile (Pocket PC) devices could not be used with iSync, but were supported by third-party applications. Prior to the release of Mac OS X 10.4, iSync also synchronized a user’s Safari bookmarks with the .

Mac subscription service provided by Apple. Starting with Mac OS X 10.4, much of iSync’s original sync functionality has been moved to the Sync Services framework, which developers can use to incorporate synchronization into their own applications. However, iSync retains responsibility for the installation, configuration, and synchronization of supported mobile handsets. Since the release of iTunes 4.8, the user interface for syncing iPods has been delegated to iTunes, although conflict resolution and substantial changes to contact information (> 5%) show the use of iSync . Synchronization with MobileMe (formerly .Mac) was then the domain of MobileMe Sync, accessed via a System Preferences panel. iSync has been removed from Mac OS X in version 10.7 (Lion). However, since the underlying framework still existed in Lion and 10.8 (Mountain Lion), it was possible to restore the functionality of iSync by using a 10.6 (Snow Leopard) installation or backup.

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