- 4.1 Public Beta: "Kodiak"
- 4.2 Version 10.0: "Cheetah"
- 4.3 Version 10.1: "Puma"
- 4.4 Version 10.2: "Jaguar"
- 4.5 Version 10.3: "Panther"
- 4.6 Version 10.4: "Tiger"
- 4.7 Version 10.5: "Leopard"
- 4.8 Version 10.6: "Snow Leopard"
- 4.9 Version 10.7: "Lion"
- 4.10 Version 10.8: "Mountain Lion"
- 4.11 Version 10.9: "Mavericks"
- 4.12 Version 10.10: "Yosemite"
- 4.13 Version 10.11: "El Capitan"
//
Apple OS History
| Year | Event |
|---|---|
| 1978 | In June of 1978 Apple introduces Apple DOS 3.1, the first operating system for the Apple computers. |
| 1984 | Apple introduces System 1. |
| 1985 | Apple introduces System 2. |
| 1986 | Apple introduces System 3. |
| 1987 | Apple introduces System 4. |
| 1988 | Apple introduces System 6. |
| 1991 | Apple introduces System 7 operating system May 13, 1991. |
| 1995 | Apple allows other computer companies to clone its computer by announcing its licensed the Macintosh operating system rights to Radius on January 4. |
| 1997 | Apple introduces Mac OS 8. |
| 1997 | Apple buys NeXT Software Inc. for $400 million and acquires Steve Jobs, Apples cofounder, as a consultant. |
| 1999 | Apple introduces Mac OS 9. |
| 1999 | Apple releases Mac OS X Server 1.0 on March 16, 1999. |
| 2001 | Apple introduces Mac OS X 10.0 code named Cheetah and becomes available March 24, 2001. |
| 2001 | Apple introduces Mac OS X 10.1 code named Puma and becomes available on September 25, 2001. |
| 2002 | Apple introduces Mac OS X 10.2 code named Jaguar and becomes available on August 23, 2002. |
| 2003 | Apple introduces Mac OS X 10.3 code named Panther October 25, 2003. |
| 2004 | Apple introduces Mac OS X 10.4 code named Tiger at the WWDC on June 28, 2004. |
| 2007 | Apple introduces Mac OS X 10.5 code named Leopard October 26, 2007. |
| 2008 | Apple introduces MobileMe at the WWDC on June 9, 2008. |
| 2009 | Apple introduces Mac OS X 10.6 code named Snow Leopard at the WWDC on June 8, 2009. |
| 2010 | Apple introduces Mac OS X 10.7 code named Lion at the "Back to the Mac" event on October 20, 2010. |
| 2012 | Apple releases Mac OS X 10.8 code named Mountain Lion on July 25, 2012. |
| 2013 | Apple introduces Mac OS X 10.9 code named Mavericks at the WWDC on June 10, 2013. |
| 2014 | Apple introduces Mac OS X 10.10 code named Yosemite at the WWDC on June 2, 2014 |
Version 10.11: "El Capitan"
Main article: OS X El Capitan
OS X El Capitan was revealed on June 8, 2015, during the WWDC keynote speech. It was made available as a public beta in July and is expected be publically available in the fall.//
http://www.macrumors.com/roundup/os-x-10-11/
//
http://www.computerhope.com/history/macos.htm
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