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|Version of OS X|
OS X Mavericks (10.9) is a version of OS X released in 2013. This version focuses on battery life improvement, and increased iCloud integration.
Although OS X Mavericks was released together with iOS 7, OS X Mavericks still retains the same user interface design from previous OS X versions. The modern interface wouldn't be utilized until OS X Yosemite in 2014.
It is the first OS X version to be released as a free upgrade on the App Store.