| As with Panther, certain older machines were no longer supported; Tiger requires a Mac with 256 MB and a built-in port | Apple's original plan with macOS was to require all developers to rewrite their software into the Cocoa APIs |
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| 6 16G2136 September 26, 2019 Old version, no longer maintained: 17 June 5, 2017 September 25, 2017 December 2020 [ ] 10 | Restrictions and limitations may apply |
| 3, , noted "It's strange to have gone from years of uncertainty and to a steady annual supply of major new operating system releases | from the original on May 15, 2009 |
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| Apple's new user interface design, using deep color saturation, text-only buttons and a minimal, 'flat' interface, was debuted with in 2013 | from the original on January 19, 2009 |