I have an iMac running OSX Snow Leopard 10.6.8. How do I upgrade to Mac OSX Lion? Where do I get the software?...how much will it cost? I am repeatedly getting a message telling me that Safari is not supported by my version of OSX. Will this upgrade help to solve that problem? I would imagine that Safari is integrated with the OSX version like I.E. is integrated with a given version of Windows.