Mac OS 9.0

Mac OS 9.0, codenamed "Sonata", is the first release of Mac OS 9, announced by Apple Computer on October 23, 1999. It was promoted by Apple CEO Steve Jobs as the best "internet OS ever" and began shipping the next day. Macintosh clones were no longer officially supported.October 23, 1999: Mac OS 9 Released by Chris Seibold, Apple Matters. 2010-10-23.
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==Development==
Mac OS 9.0 originally began development in early 1999 as Mac OS 8.7.Mac OS 8.7 Screen Shots Debut on the Web by Jason O'Grady, O'Grady's PowerPage 1999-02-01.Mac OS 8.7 (Sonata) Turns Beta!, AppleInsider. 1999-07-01.
==References==
==External links==
*Mac OS 9 at Apple (archived 2000-11-09)
**Mac OS 9 is coming (archived 1999-10-12)
**Technical Note TN1176: Mac OS 9 at Apple Developer Connection (2000-08-24, archived 2004-11-13)
*Mac OS 9.0 at the Graphical User Interface Gallery
Category:1999 introductions