Apple's newest version of OS X was made available on Wednesday, and for only a $19 upgrade, includes many new features. As the line between iOS and OS X keeps getting blurry, Mountain Lion has an iOS-like Notification Center, compatible Notes and Reminders apps, and integration with Game Center.
However, not every Mac will run Mountain Lion. It requires at least a Core 2 Duo processor, 2GB of RAM, 8GB of free hard disk space, and currently running 10.6.8 or later. Below is a list of the compatible models: