I'm just curious, does anyone know how Apple retail stores upgrade their inventory to new OSs? For, example Mountain Lion is coming out later this month so does that mean the night before its due to be released Apple employees install Mountain Lion on all existing computers in their inventory (because up until ML is released computers sell with Lion on them.). Or do Apple stores only stock a select amount of Lion computers with the hope of running out right before ML is released? However, this causes problems because they may both ave any computers left to sell right before ML release day....anyone know how this is handled?