Mac OS 9 is the ninth major release of Apple's classic Mac OS operating system which was succeeded by Mac OS X (renamed to OS X in 2011 and macOS in 2016) in 2001. Introduced on October 23, 1999, it was promoted 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.
|Version of the classic Mac OS operating system|
|Working state||Historic, not supported|
|Source model||Closed source|
|Released to |
|October 23, 1999|
|Latest release||9.2.2 / December 5, 2001|
|Preceded by||Mac OS 8|
|Official website||Apple - Products - Mac OS 9 at the Wayback Machine (archived November 9, 2000)|
|Tagline||Your Internet co-pilot.|
|Historical, unsupported as of February 1, 2002|
|Part of a series on|
|Classic Mac OS|
Apple discontinued development of Mac OS 9 in late 2001, transitioning all future development to Mac OS X. The final updates to Mac OS 9 addressed compatibility issues with Mac OS X while running in the Classic Environment and compatibility with Carbon applications. At the 2002 Worldwide Developers Conference, Steve Jobs began his keynote address by staging a mock funeral for OS 9.
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