Mac OS X Leopard – 10.5

Mac OS X version 10.5 Leopard, is the sixth major update to Mac OS X for Apple’s Macintosh computers, and was released on October 26, 2007.

Mac OS X 10.5 Leopard was available as an upgrade to new Apple computers purchased after October 1, 2007 that did not already have Mac OS X 10.5 installed or a Leopard upgrade DVD included. Leopard was the last OS released by Apple to support both the Intel and PowerPC architects.

It is the first version of Mac OS X to discontinue support for G3 systems and represents a new version of Aqua that Apple would use until Snow Leopard. It is also the latest version of Mac OS X to have support for Intel Pentium 4 processors, although this can only be seen with Hackintosh models as there are no retail Macs that ship with the Pentium 4s. The universal binary concept was expanded in Leopard, as separate versions for Intel and PowerPC Macs were merged in Leopard and installation media could be used for both systems. The first 64-bit Mac apps were designed for Leopard because of the new 64-bit user area (the core remained 32-bit until Snow Leopard).

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