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One thing to consider, don't do a mass convert at all. When you send an EPUB book to your Kindle, it will convert at that time to AZW3, then do a send seamlessly. So only the books you actually go to read from this point on are converted. Perhaps years in the future Amazon will support EPUBS (one can dream) or your next reader after your Kindle might, so you would be converting back anyways, possible with an odd formatting quirk creeping in.
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