The Apple Mac OS X 10.5.4 Leopard Operating System Software DVD MB576Z/A is a retail version of the operating system designed for Apple Mac OS X 10.5 and Leopard users. This DVD includes the necessary software to install and run the operating system on your computer. With a focus on English language and originating from the United States, this product is a reliable and official choice for those looking to upgrade or reinstall their Mac OS X operating system.