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",[2] 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,[3] lasting improvements include the introduction of an automated Software Update engine and support for multiple users.

Quick facts: Developer, OS family, Working state, Source m...
Mac OS 9
Version of the classic Mac OS operating system
Screenshot of Mac OS 9.0.4
DeveloperApple Computer
OS familyMacintosh
Working stateHistoric, not supported
Source modelClosed source
Released to
manufacturing
October 23, 1999; 23 years ago (October 23, 1999)
Latest release9.2.2 / December 5, 2001; 20 years ago (2001-12-05)[1]
Kernel typeNanokernel
LicenseProprietary
Preceded byMac OS 8
Succeeded by
Official websiteApple - Products - Mac OS 9 at the Wayback Machine (archived November 9, 2000)
TaglineYour Internet co-pilot.
Support status
Historical, unsupported as of February 1, 2002
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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.[4]

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