Spotted around the interwebs recently is a Windows 7 Upgrade Chart that details which versions of Windows can be upgraded to Windows 7 by upgrading in place, and which versions need a clean install, or in Microsoft speak, a Custom Install. With the upcoming release of Mac OS X 10.6 Snow Leopard, I’ve drawn up a chart to cover the same thing and dispel any confusion. 
Mac OS X Upgrades
Spotted around the interwebs recently is a Windows 7 Upgrade Chart that details which versions of Windows can be upgraded to Windows 7 by upgrading in place,...
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