Timeline: Mac OS X

Mac OS X Server 1.0 - The very first version was launched in 1999, which retained the earlier Mac operating system's 'platinum' appearance and even resembled OPENSTEP in places.

Mac OS X Server 1.0 - The very first version was launched in 1999, which retained the earlier Mac operating system's 'platinum' appearance and even resembled OPENSTEP in places.

photos

1/10 Mac OS X Server 1.0 - The very first version was launched in 1999, which retained the earlier Mac operating system's 'platinum' appearance and even resembled OPENSTEP in places.

Mac OS X v10.0 (Cheetah) - The desktop-oriented version followed in March 2001 sporting the new Aqua user interface. Since then, seven more distinct 'end-user' and 'server' versions have been released.

2/10 Mac OS X v10.0 (Cheetah) - The desktop-oriented version followed in March 2001 sporting the new Aqua user interface. Since then, seven more distinct 'end-user' and 'server' versions have been released.

Mac OS X v10.1 (Puma) - It was released on 25 September 2001 as a 'free update' to version 10.0. The OS was handed out for no charge by Apple employees after Steve Jobs' keynote speech at the Seybold publishing conference in San Francisco.

3/10 Mac OS X v10.1 (Puma) - It was released on 25 September 2001 as a 'free update' to version 10.0. The OS was handed out for no charge by Apple employees after Steve Jobs' keynote speech at the Seybold publishing conference in San Francisco.

Mac OS X v10.2 (Jaguar) - Jaguar was a large step forward in the areas of stability, general speed enhancements, compatibility with other flavors of Unix and was the first Mac OS X release to publicly use its code name.

4/10 Mac OS X v10.2 (Jaguar) - Jaguar was a large step forward in the areas of stability, general speed enhancements, compatibility with other flavors of Unix and was the first Mac OS X release to publicly use its code name.

Mac OS X v10.3 (Panther) - Some of the most popular features of Panther were Finder, Fast User Switching, Exposé, Xcode, Preview, iChat & Safari.

5/10 Mac OS X v10.3 (Panther) - Some of the most popular features of Panther were Finder, Fast User Switching, Exposé, Xcode, Preview, iChat & Safari.

Mac OS X v10.4 (Tiger) - Tiger was the first version of any released Apple operating system to work on Apple–Intel architecture machines & the longest running version of Mac OS X.

6/10 Mac OS X v10.4 (Tiger) - Tiger was the first version of any released Apple operating system to work on Apple–Intel architecture machines & the longest running version of Mac OS X.

Mac OS X v10.5 (Leopard) - Leopard introduces a redesigned Dock, Stacks, a semitransparent menu bar, an automated backup utility called Time Machine and an updated Finder that incorporates the Cover Flow visual navigation interface.

7/10 Mac OS X v10.5 (Leopard) - Leopard introduces a redesigned Dock, Stacks, a semitransparent menu bar, an automated backup utility called Time Machine and an updated Finder that incorporates the Cover Flow visual navigation interface.

Mac OS X v10.6 (Snow Leopard) - Snow Leopard was publicly unveiled on June 8, 2009 at the Apple Worldwide Developers Conference. Unlike previous versions of Mac OS X, the goals with Snow Leopard were improved performance, greater efficiency and the reduction of its overall memory footprint.

8/10 Mac OS X v10.6 (Snow Leopard) - Snow Leopard was publicly unveiled on June 8, 2009 at the Apple Worldwide Developers Conference. Unlike previous versions of Mac OS X, the goals with Snow Leopard were improved performance, greater efficiency and the reduction of its overall memory footprint.

Mac OS X v10.7 (Lion) - brings many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the Mac, and includes support for the Mac App Store, as introduced in Mac OS X Snow Leopard version 10.6.6.

9/10 Mac OS X v10.7 (Lion) - brings many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the Mac, and includes support for the Mac App Store, as introduced in Mac OS X Snow Leopard version 10.6.6.

Mac OS X v10.8 (Mountain Lion) - At 8:30 a.m. EST Thursday, the developer preview version of Mountain Lion was live and available to Apple’s legions of app makers. It comes up with many new iOS-like features like Reminders, iMessage, Game Center, Notifications, iCloud and Twitter integration.

10/10 Mac OS X v10.8 (Mountain Lion) - At 8:30 a.m. EST Thursday, the developer preview version of Mountain Lion was live and available to Apple’s legions of app makers. It comes up with many new iOS-like features like Reminders, iMessage, Game Center, Notifications, iCloud and Twitter integration.