Clean install of Windows 7 upgrade OS

I have seen many blogs and web sites that claim you can do a clean install of Windows 7 with a upgrade disc. I've also noticed that these sites are dated back to the final months of 2009. I haven't seen anything in 2010 or recently. Can this indicate that this method is no longer possible? And yes, I have read what Microsoft's position is on this method. I just wanted to know if this method still works.

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