DirectX 10: why it's exclusive to Vista

When Microsoft officially announced that DirectX 10 (DX10) would only be available for Windows Vista, many gaming fans yearning to be on the bleeding edge were upset. In order to get the most from their video cards, users would have to upgrade their operating systems to Vista. Some have attributed Microsoft's decision to be purely based on marketing, but that's not entirely the case. What other factors were in play?

According to Microsoft DirectX guru Phil Taylor, development for DX10 wasn't complete until late in Windows XP's lifecycle, and during the time of its development, things became clear that DX10 simply would not fit into XP.

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