Which version do I need to buy to update my Mac bo pro which still runs on 10.5.8
For Snow Leopard v10.6 and Lion v10.7 > System requirements for OS X Lion and Mac OS X v10.6
And for v10.8 Mountain Lion > System requirements for OS X Mountain Lion
v10.6 can be purchased directly from the Apple Store > Mac OS X 10.6 Snow Leopard - Apple Store
v10.7 and v10.8 can be purchased from the App Store which requires v10.6.6 or later > About the Mac App Store
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