Mac OS X v10.4 Tiger is the fifth major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers. Tiger was released to the public on 29 April 2005 for US $129.95 as the successor to Mac OS X Panther (version 10.3), which had been released 18 months earlier. Tiger was succeeded by Mac OS X v10.5 Leopard on 26 October 2007, after 30 months, making Tiger the longest running version of Mac OS X. Some of the new features include a fast searching system called Spotlight, a new version of the Safari web browser, Dashboard, a new 'Unified' theme, and improved support for 64-bit addressing on Power Mac G5s.
Tiger was included with all new Macintosh computers, and was also available as an upgrade for existing Mac OS X users, or users of supported pre-Mac OS X systems. The server edition, Mac OS X Server 10.4, was also available for some Macintosh product lines. Tiger is also the first version of any released Apple operating system to work on Apple–Intel architecture machines (Apple machines using x86 processors). The Apple TV, as released in March 2007, ships with a customized version of Mac OS X Tiger branded "Apple TV OS" that replaces the usual graphical user interface with an updated version of Front Row.
Six weeks after its official release, Apple had delivered 2 million copies of Tiger, representing 16% of all Mac OS X users. Apple claimed that Tiger was the most successful Apple OS release in the company's history. At the World Wide Developers Conference on June 11, 2007, Apple's previous CEO Steve Jobs announced that out of the 22 million Mac OS X users, more than 67% were using Tiger. Tiger is the last version of Mac OS X to support a Mac OS 9 compatibility layer called Classic Environment. However, Classic Environment will not work on Intel Macs.
The last security update released for Tiger users was the 2009-005 update. The next security update, 2009-006 only included support for Leopard and Snow Leopard. The latest version of QuickTime is 7.6.4. The last version of iTunes that can run on Tiger is 9.2.1, because 10.0 only supports Mac OS X Leopard and later. Safari 4.1.3 is the final version for Tiger as of 18 November 2010. Despite not having received security updates since then, Tiger remains popular with Power Mac users and retrocomputing enthusiasts due to its wide software and hardware compatibility, as it runs on a wide variety of older machines and still supports most classic Mac OS applications.