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					Originally Posted by  writerkit
					 
				 
				It discourages the use of "both" or "new" so I've been using "old." I suppose I could make the guess then that I'm making a MOBI file for use on Kindles prior to KF8, but that would only be a guess. 
			
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 Yes, you are building a book for the old Kindle model. Here you can't use the fonts you want.