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					Originally Posted by  Terisa de morgan
					 
				 
				Indeed, if you get calibre 2.0, you can install Qt5 over Windows XP, but you could find problems (in the same way you could find problems in LInux if you install a new package over an older distro), and as it looked like the problems were common, the installation was restricted inside calibre. 
			
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 It's certainly true that QT5 isn't officially supported on Windows XP, but that's an entirely separate issue.