This is the final version of Mac OS X which can support the PowerPC structure as snow leopard function only on Intel-based Macs. The retail price for the desktop version is $129 and $499 for the server version. It is available in two editions: for desktop or personal computers and server version (Mac OS X Server). Mac OS Leopard 10.5 is the sixth release by Mac OS for Apple's desktop and server operating system for Macintosh computers. Mac Os 10.5.8 Download Os 10 5 8 Download.