

Rather than delivering big changes to the appearance and end user functionality like the previous releases of Mac OS X, the development of Snow Leopard was deliberately focused on "under the hood" changes, increasing the performance, efficiency, and stability of the operating system.
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Mac OS X Snow Leopard was released on August 28, 2009, the last version to be available on disc. Messages, an instant messaging software application, replaces iChat Notes is added, as an application separate from Mail, synching with its iOS counterpart through the iCloud service. Notification Center is added, providing an overview of alerts from applications. Mountain Lion also includes more Chinese features, including support for Baidu as an option for Safari search engine. Application pop-ups are now concentrated on the corner of the screen, and the Center itself is pulled from the right side of the screen. Notification Center, which makes its debut in Mountain Lion, is a desktop version similar to the one in iOS 5.0 and higher.


It also includes support for storing iWork documents in iCloud. It incorporates some features seen in iOS 5, which include Game Center, support for iMessage in the new Messages messaging application, and Reminders as a to-do list app separate from iCal (which is renamed as Calendar, like the iOS app). OS X Mountain Lion was released on July 25, 2012.
