Maybe old news to some, but MS has released DX11 for Vista systems. The "Platform update" apparently also includes some Win 7 features backported for Vista as well. Vista SP2 needs to be installed first. I checked DXdiag yesterday and sure enough, it's showing DX11. Don't really think it makes a difference with FSX, but it's nice that MS is releasing it for Vista (WinXP is stuck with DX9).
http://www.anandtech.com/weblog/showpost.aspx?i=652
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