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Sure, you can simply purchase Mountain Lion from the Mac App Store and click the Upgrade button, but we think it’s a much better idea to prepare your system so that after you upgrade, you can get back to work with the least amount of trouble and disruption. In this to-the-point ebook, OS X expert Tom Negrino walks you through the steps you should accomplish before clicking that fateful button. You’ll lay the groundwork for the upgrade, evaluate your Mac and your apps, and learn how to protect your work in the rare event that something goes horribly wrong.