Mac OS X version 10.5 “Leopar” is the sixth major release of Mac OS X, Apple’s desktop and server operating system for Macintosh computers, and is the successor to Mac OS X v10.4 "Tiger". Leopard was released on 26 October 2007, and is available in two variants: a desktop version suitable for personal computers, and a server version, Mac OS X Server. Apple offers a reduced-cost upgrade to people that purchased new Apple computers after 1 October 2007 that do not already have Mac OS X v10.5 pre-installed or a Leopard upgrade DVD included. Steve Jobs stated at MacWorld 2008 that over 20% of Macs use Leopard as their operating system.