The biggest factor is the cost, and the number of variants, at the end of the day people want an OS that works and they want to pay something reasonable for it, i.e. less than £90.00. The cost of Vista is nothing short of daylight robbery and it has nothing much to offer over XP apart from DirectX 10 and some fancy eye candy. It clearly isn't what Longhorn was supposed to be. With Vista sales going they way they are it looks increasingly feasible that DX10 may somehow make it into XP possibly as part of SP3.
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