by An easy way to keep your Mac healthy is to keep your apps current. Why? Bug fixes, security updates, new features—need I go on? Resolve to stay on top of updates in the new year.
Upgrade to OS X Mountain Lion (if you can)
If you haven’t gotten around to upgrading to Mountain Lion (OS X 10.8), now’s the time to forge ahead to get new and improved apps and features. Not sure which OS version you’re running? Choose About This Mac in the Apple menu; and in the window that appears, look beneath ‘OS X’ to see the version number. Mountain Lion is 10.8.x; Lion is 10.7.x. The two previous systems are Snow Leopard (10.6.x) and Leopard (10.5.x).
Can your Mac run Mountain Lion? Check this Apple page for a list of compatible models. You’ll find model descriptions there, but how can you tell whether you have, for instance, a “MacBook Pro (Mid/Late 2007 or newer)”? In Lion, choose About This Mac in the Apple menu, and click the More Info button. You’ll see the model description immediately beneath the model name, near the top of the resulting pop-up box.
In earlier systems, start by getting your serial number from the About This Mac window: Click twice on the version number beneath ‘Mac OS X’ to cycle to the serial number. Then go to Apple’s Service and Support Coverage Page, enter the serial number, and click Continue. You’ll see your model description.
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