Mac OS X Only Macs as of Jan 2003

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Apple annonunced that all new Mac models as of January 2003 will only boot into Mac OS X. Classic compatibility will remain.

Now its time for Apple and our third-party developers to focus all of our resources exclusively on Mac OS X, rather than dividing them between two different operating systems. -- Steve Jobs.

Apple's removal of OS 9 support has been rumored as far back as June 2002 with further hints in August (1, 2)