HT201260: Find the OS X version and build number on your Mac
Learn about Find the OS X version and build number on your Mac
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Dec 12, 2012 12:03 PM in response to songbird72290by mende1,Welcome to the Apple Support Communities
Buy Snow Leopard > http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard Then, make a backup, insert the DVD and upgrade. Finally, open > Software Update and install the latest version.
Mountain Lion requires a Late 2008 Aluminum or Early 2009 MacBook, so if you've a supported Mac, open App Store and purchase Mountain Lion. Check if your programs are supported > http://www.roaringapps.com
If it's not supported, call Apple to purchase Lion > http://support.apple.com/kb/HE57 Also, you can keep Snow Leopard