Microsoft have recently formed a HD DVD forum with Toshiba so they are have more involvement in this than simple deciding to use HD DVD add ons for the 360. I am not sure other than annoying Sony what MS actually get out of it, but if Blu Ray fails you have to wonder how that would leave the PS3 in the market place so maybe that is the underlying reasoning.
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Microsoft have recently formed a HD DVD forum with Toshiba so they are have more involvement in this than simple deciding to use HD DVD add ons for the 360. I am not sure other than annoying Sony what MS actually get out of it, but if Blu Ray fails you have to wonder how that would leave the PS3 in the market place so maybe that is the underlying reasoning.