Mac OS X Panther

Mac OS X Panther (version 10.3) is the fourth major release of macOS, Apple's desktop and server operating system. It followed Mac OS X 10.2 and preceded Mac OS X Tiger. It was released on October 24, 2003.
System requirements.
Panther's system requirements are:
Video conferencing requires:
Since a New World ROM was required for Mac OS X Panther, certain older computers (such as beige Power Mac G3s and 'Wall Street' PowerBook G3s) were unable to run Panther by default. Third-party software (such as XPostFacto) can, however, override checks made during the install process; otherwise, installation or upgrades from Jaguar fails on these older machines.
Panther still fully supported the Classic environment for running older Mac OS 9 applications, but made Classic application windows double-buffered, interfering with some applications written to draw directly to screen.
New and changed features.
End-user features.
Apple advertised that Mac OS X Panther had over 150 new features, including:
References.
 