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The necessity for doing mobi to mobi conversion comes from the brokenness of Amazon's firmware, or the brokenness of older mobi files that dont allow metadata to be updated, neither of which has anything to do with calibre.
If all your mobi files work on an older kindle, they are likely to continue to work on a newer kindle. And if not doing a bulk mobi to mobi conversion is just a couple of clicks in calibre.
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