All macOS versions

 MacOS X 10.3, code named “Panther”, adds features such as Expose, fast user switching, and the Safari web browser. Released in October 2003, Mac OS X 10.3 Panther cut off “Old World ROM” Macs like the beige Power Mac G3s and some early PowerBook G3 models. Many users worked their way around this with third-party tools that would trick the installer. For their work, users were rewarded with a streamlined version of OS X with a revamped Finder (now clad in Brushed Metal, sadly), Fast User Switching, Exposé for window management, FileVault, Font Book and iChat AV, among other features and updates, including built-in Fax support.

 Jaguar was the first version of OS X to support Safari and the last the ship with Internet Explorer as its default browser. Apple’s release of it Safari web browser was Microsoft’s excuse to leave the Mac browser market. Jaguar improved performance across the board, especially for Classic Mode , and introduced Quartz Extreme, which lets the operating system offload graphics tasks to supported video cards (ATI Radeon and Nvidia GeForce 2 AGP and later video with at least 16 MB of VRAM). Mac OS X 10.2 Jaguar was released on 2002.08.24 and was last updated on 2003.10.03, when the 10.2.8 update was released. There were rumors that 10.2.9 would be released in mid-2009 to address several bugs and vulnerabilities that remained in version 10.2.8, but that never happened.