Hi I bought for my mother who does not have the happiness of being stung like me to Mac OS X. recognize progress W7! amazing, installation made his little life by getting what he needs in the updates. The 64-bit does not affect the operation of 32-bit apps. And finally once will not hurt, the price of 90 for a single license is finally reasonable. 4 stars only because it is not yet the world-class Mac OS X.6 ;-)