The OS licenses you get via MSDN subscriptions are not retail - they are for testing purposes only. (E.g. you are not allowed to install them on your main work machine for example, except in virtual machines within a retail host OS.) Therefore they don't count in Microsoft's sales numbers. And note you are not charged for MSDN OS testing licenses as retail - you are charged for being enabled to test your software on wide selection of OSes without the need to pay retail prices for them.I wonder if they count the licenses that are given to MSDN subscribers in that number. I know we never use all the licenses we get... though, I suppose we are still charged for them either way even if it isn't retail value.