So for the few of us that use OS X and are using older versions of OS X, the Windows Phone app found in the App Store requires 10.7.4 and above. I'm running Snow Leopard, and have to upgrade. >_>; I don't know why this version of Windows Phone isn't able to install on 10.6.8, so annoying, but just thought I'd let anyone know that is running Snow Leopard, that you need Lion and above to download the Windows Phone app from the App Store.