Apple  Mac OS X Version 10.5.6 Leopard (OLD VERSION) Introduces over 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 Easily and automatically back up and restore lost files or a complete Mac with Time Machine Create groups of applications and instantly switch between them with Spaces Take advantage of the latest developments in processor hardware with full native 64-bit support, multi-core optimization, and new Core animation