Until it can stand tall and proclaim it is doing just that, and perhaps more importantly the end user can believe as much, in the same way that they believe Apple and the various flavours of Linux, I am afraid that I cannot actually think of a single reason why I shouldn't blame Microsoft until the cows come home.
Last year, Microsoft’s Hotmail service lost several thousand user passwords in just this way.
Between the patching, the re-re-reboots, the war against malware, and disasters like this one, wouldn’t the world be much further ahead to use GNU/Linux instead? If GNU/Linux lacks features that users of IT feel is important, they could spend their money on improving GNU/Linux instead of keeping that other OS alive, sometimes. All these billions could be put to better use.
For a long time M$ sold licences the same price everywhere but lately, in order to block un-licensed software and GNU/Linux, they have seriously cut prices in places like China. If SCOTUS decides that the first-sale rule applies to importations, M$ will face stiff competition by importations of its own products. M$ could respond by not selling in foreign markets, or cutting prices globally. Both would seriously impact the bottom line but would finally force the monopoly to compete on price everywhere and not just to stifle competition. It is silly to charge $100+ in the USA for stuff that sells for $3 in China. They could modify the EULA, perhaps (if this is not covered already), but on what basis would the BSA prosecute?