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Mac OS X is the most recent of Apple Inc.'s Mac OS line of operating systems. Although it is officially designated as simply "Version 10" of the Mac OS, it has a history largely independent of the earlier Mac OS releases. This model is also called the "Snow Leopard" as the older version was the 'Lion".

Development Outside of Apple[]

When Apple Computer sidelined Steve Jobs in 1985, he attempted - with funding from Ross Perot and his own pockets - to create the "next big thing": the result was NeXT. NeXT hardware, while somewhat innovative for its time, was more expensive in relation to the rapidly commoditizing workstation market, had several design problems and quirks which made it unpopular, and was phased out in 1993. The object-oriented operating system NeXTSTEP, on the other hand, had a more lasting legacy. It was based on on the Mach kernel and BSD, an open source implementation of Unix dating back to the 1970s, and included the innovative Enterprise Objects Framework database access layer and WebObjects application server development environment. NeXT managed to maintain a business selling WebObjects and consulting services, but was never a commercial success. NeXTSTEP underwent an evolution into OPENSTEP which separated the object layers from the operating system below, allowing it to run with less modification on other platforms. However, by this point, a number of other companies—notably Apple, IBM, and Microsoft—were claiming they would soon be releasing similar object-oriented operating systems and development tools of their own. (Some of these efforts, such as Taligent, did not fully come to fruition.)

Internal Development[]

Meanwhile, Apple was in fact having commercial difficulties as well. The aging classic Mac OS had reached the limits of its single-user, cooperative multitasking architecture, and its once-innovative user interface was looking increasingly "dated" next to the rapidly-evolving Microsoft Windows. A massive development effort to replace it, known as Copland, was started in 1994, but was generally perceived outside of Apple to be a hopeless case due to political infighting. By 1996 Copland was nowhere near ready for release, and the effort was eventually cancelled outright. Some elements of Copland were incorporated in Mac OS 8, released in 1997.

After considering the purchase of BeOS - a multimedia-enabled multi-tasking OS designed for hardware similar to Apple's - the company decided instead to acquire NeXT and use OPENSTEP as the basis for their new OS. Avie Tevanian took over OS development and Steve Jobs was brought on as a consultant. At first the plan was to develop a new operating system based almost entirely on an updated version of OpenStep, with an emulator - known as the Blue Box - for running "classic" Macintosh applications. The result was known under the code name Rhapsody, slated for release in late 1998.

Apple expected that developers would port their software to the considerably more powerful OpenStep libraries once they learned of its power and flexibility. Instead, the vast majority of developers told Apple that this would never occur, and that they would rather leave the platform entirely. This "rejection" of Apple's plan was largely the result of a string of previous broken promises from Apple; after watching one "next OS" after another disappear and Apple's marketshare dwindle, developers were not interested in doing much work on the platform at all, let alone a re-write.

Changed Direction Under Jobs[]

Apple's financial losses continued, and eventually Jobs persuaded the board of directors to fire CEO Gil Amelio and appoint him Chairman and interim CEO. Jobs was, in essence, given carte blanche by the Apple board to return the company to profitability. When Jobs announced at the Worldwide Developers Conference that what developers really wanted was a modern version of the Mac OS, and that's what they were going to deliver, this was met with thunderous applause. Over the next two years major effort was applied to re-writing the original Macintosh APIs as Unix libraries known as Carbon. Mac OS applications could be ported to Carbon without the need for a re-write, while still making them full citizens of the new operating system. Meanwhile, applications written using the older toolkits would be supported using the "Classic" Mac OS 9 emulator. Including support for the use of C, C++, Objective C, Java, and Python furthered developer comfort.

During this time the lower layers of the operating system (the Mach kernel and the BSD layers on top of it), were re-packaged and released under an open source license as Darwin. The Darwin kernel provides an extremely stable and flexible operating system which rivals many other Unix implementations, and takes advantage of the contributions of programmers and independent open-source projects outside of Apple; however it is unclear if it sees any real use outside the Macintosh community. During this period the Java programming language became the "hot topic" in the programming world, and an effort was started to make the Mac the best Java platform. This consisted of both porting an excellent high-speed Java system to the platform, as well as exposing OS-X-specific "Cocoa" APIs to the Java language. The resulting changes delayed the introduction of the operating system by about two years.

While the first release of the new OS - Mac OS X Server 1.0 - used a modified version of the Mac OS GUI, Mac OS X Public Beta and later used a new GUI known as Aqua. The development of this part of the OS was delayed somewhat by the switch from OpenStep's Display PostScript engine to one that was license free, known as Quartz. Aqua was a fairly radical departure from the Mac OS 9 interface, which had been essentially just an improved color version of the Finder version 1.0 shipped with the original Macintosh. It incorporated such "eye candy" as full colour scalable graphics, anti-aliasing of text and graphics, simulated shading and highlights, transparency and shadows, and animation. A key new feature was the Dock, an application launcher which took full advantage of these capabilities. But it maintained a substantial degree of compatibility with the traditional Mac OS interface and Apple's own Human Interface Guidelines, with its pull-down menu at the top of the screen, familiar keyboard shortcuts, and support for a single-button mouse.

Development of Mac OS X[]

Apple released Mac OS X Server 1.0, in January 1999. A public beta of Mac OS X was released in 2000 and March 24, 2001, saw the full and official release of Mac OS X version 10.0. Mac OS X 10.1 ("Puma") shipped on September 26, 2001, followed by the August 24, 2002 release of Mac OS X 10.2 ("Jaguar") and the October 24, 2003 release of Mac OS X 10.3 ("Panther"). In June 2004, Jobs announced that version 10.4 ("Tiger") would be released in the first half of 2005.

Mac OS X 10.0[]

Apple shipped Mac OS X 10.0 "Cheetah" on March 24, 2001. The first version was somewhat lacking, with incomplete support for CD burning and the usage of DVDs.

Mac OS X 10.1[]

Apple shipped Mac OS X 10.1 "Puma" on September 26, 2001. This new version was what many dubbed the "first really usable version" of Mac OS X. Amongst the major changes: major speedbumps, support for many peripherals, and major debugging, as well as the addition of new features and the optimisation of existing features.

Mac OS X 10.2[]

Mac OS X 10.2 "Jaguar" was shipped on August 24, 2002. It included the wildly popular iChat, as well as numerous new features.

Mac OS X 10.3[]

Apple shipped Mac OS X 10.3 "Panther" on October 24, 2003. Mac OS X 10.3 "Panther" included an AV-ready version of iChat (iChat AV), a completely new Finder window interface (including near-live search and a sidebar), and an enhanced Preview application.

Mac OS X 10.4[]

Apple shipped Mac OS X 10.4 "Tiger" on April 29, 2005. In this new version, Spotlight, Automator, Dashboard and the new Mail application made for some of the most important -- and the most welcome -- additions to the new system.

Mac OS X 10.5[]

Apple shipped Mac OS X 10.5 "Leopard" on October 26, 2007.

Mac OS X 10.6[]

Apple shipped Mac OS X 10.6 "Snow Leopard" on August 28, 2009.

Mac OS X 10.7[]

Apple shipped Mac OS X 10.7 "Lion" on July 20, 2011.

Mac OS X 10.8[]

Apple shipped Mac OS X 10.8 "Mountain Lion" on July 25, 2012

Mac OS X 10.9[]

Apple shipped Mac OS X 10.9 "Mavericks" on October 22, 2013.

Mac OS X 10.10[]

Apple shipped OS X 10.10 "Yosemite" on October 16, 2014.

See also[]

Sources and References[]

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