Mac OS 9

Mac OS 9 is the ninth and final major release of Apple's Classic Mac OS operating system. Introduced on October 23, 1999, it was positioned by Apple as "The Best Internet Operating System Ever", highlighting Sherlock 2's Internet search capabilities, integration with Apple's free online services known as iTools and improved Open Transport networking. While Mac OS 9 lacks protected memory and full pre-emptive multitasking, lasting improvements include the introduction of an automated Software Update engine and support for multiple users.