Apple Mac OS X Version 10.5.6 Leopard [5-User Family Pack] Take advantage of the latest developments in processor hardware with full native 64-bit support, multi-core optimization, and new Core animation Easily and automatically back up and restore lost files or a complete Mac with Time Machine Introduces more than 300 new and enhanced features to OS X, including a new desktop and updated finder enabling easy browsing and sharing between multiple Macs The Mac OS X Leopard Family Pack is a single-residence, five-user license Preview files without opening an application using Quick Look The Mac OS X Leopard Family Pack is a single-residence, five-user license Introduces more than 300 new and enhanced features to OS X, including a new desktop And updated finder enabling easy browsing and sharing between multiple Macs Preview files without opening an application using Quick Look Take advantage of the latest developments in processor hardware with full native 64-bit support, multi-core optimization, and new Core animation