Mac OS X 10.5 Leopard, released on October 26, 2007, was the biggest change to Mac OS X since Apple first released OS X 10.0 in March 2001. For the first time, a version of OS X was certified as Unix, and the new unified appearance makes Leopard friendlier and less confusing for users.
Leopard itself was also a unified operating system. Where had come in separate versions for PowerPC and Intel Macs, the Leopard installer could run on both platforms, and the version of Mac OS X installed could boot either type of hardware. New features included Time Machine automated backup, Stacks, and Cover Flow. But with every big step forward in features and performance, the Mac OS leaves some older Macs behind.
The number of Macs that had been supported by Tiger and left behind by Leoaprd was the biggest for any release of OS X to date: No G3 models were supported, and the installer would not run G4 Macs slower than 867 MHz, although a few workarounds were discovered to address that. Leopard is immune to identified in early 2014. After 22 months as the current version of OS X (only Tiger lasted longer, at 30 months), Leopard was succeeded by on August 28, 2009, the first version of OS X to leave all PowerPC Macs behind. • Leopard Forum, our online group for OS X 10.5 users.
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