<P> Mac OS X 10.1 (internally codenamed Puma) was released on September 25, 2001 . It had better performance and provided missing features, such as DVD playback . Apple released 10.1 as a free upgrade CD for 10.0 users, in addition to the US $129 boxed version for people running Mac OS 9 . It was discovered that the upgrade CDs were full install CDs that could be used with Mac OS 9 systems by removing a specific file; Apple later re-released the CDs in an actual stripped - down format that did not facilitate installation on such systems . On January 7, 2002, Apple announced that Mac OS X was to be the default operating system for all Macintosh products by the end of that month . </P> <P> On August 23, 2002, Apple followed up with Mac OS X 10.2 Jaguar, the first release to use its code name as part of the branding . It brought great raw performance improvements, a sleeker look, and many powerful user - interface enhancements (over 150, according to Apple), including Quartz Extreme for compositing graphics directly on an ATI Radeon or Nvidia GeForce2 MX AGP - based video card with at least 16 MB of VRAM, a system - wide repository for contact information in the new Address Book, and an instant messaging client named iChat . The Happy Mac which had appeared during the Mac OS startup sequence for almost 18 years was replaced with a large grey Apple logo with the introduction of Mac OS X 10.2 . </P> <P> Mac OS X Panther was released on October 24, 2003 . In addition to providing much improved performance, it also incorporated the most extensive update yet to the user interface . Panther included as many or more new features as Jaguar had the year before, including an updated Finder, incorporating a brushed - metal interface, Fast user switching, Exposé (Window manager), FileVault, Safari, iChat AV (which added videoconferencing features to iChat), improved Portable Document Format (PDF) rendering and much greater Microsoft Windows interoperability . Support for some early G3 computers such as "beige" Power Macs and "WallStreet" PowerBooks was discontinued . </P> <P> Mac OS X Tiger was released on April 29, 2005 . Apple stated that Tiger contained more than 200 new features . As with Panther, certain older machines were no longer supported; Tiger requires a Mac with a built - in FireWire port . Among the new features, Tiger introduced Spotlight, Dashboard, Smart Folders, updated Mail program with Smart Mailboxes, QuickTime 7, Safari 2, Automator, VoiceOver, Core Image and Core Video . The initial release of the Apple TV used a modified version of Tiger with a different graphical interface and fewer applications and services . On January 10, 2006, Apple released the first Intel - based Macs along with the 10.4. 4 update to Tiger . This operating system functioned identically on the PowerPC - based Macs and the new Intel - based machines, with the exception of the Intel release dropping support for the Classic environment . Only PowerPC Macs can be booted from retail copies of the Tiger client DVD, but there is a Universal DVD of Tiger Server 10.4. 7 (8K1079) that can boot both PowerPC and Intel Macs . </P>

What animal was used as a code name for mac os x 10.3