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					Originally Posted by  Catlady
					 
				 
				But when I couldn't convert Amazon books in Calibre, that suggestion did solve the problem. Didn't make sense to me; I subsequently unchecked the box, and the problem stayed solved. 
			
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 Right!  It's almost as if you have to "train" Calibre to recognize and import the AZW3 format - for subsequent conversions & plug-ins to work.