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Mac OS Leopard is version 10.5 of Mac OS X for Apple’s personal computers. Mac OS Leopard was the last version to support the PowerPC architecture that did not include Intel-based Macs. Mac OS Leopard was the successor of Mac OS Tiger and was superseded by Snow Leopard (version 10.6).
Being the 6th major release of Mac OS X, this version had a number of innovative new features introduced by Apple, such as Time Machine (the system stored all versions of a file in an internal or external hard drive), BootCamp (granting the ability to easily boot into a different operating system), Dictionary and Spaces (form of a virtual desktop machine). Released in Late 2007, Mac OS Leopard had two versions of the system for desktop users as well as a separate version for servers. The operating system was lightweight, requiring only 512 MB RAM and minimum 9 GB of internal memory for the Mac system to install it.