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Note that mobi format is being deprecated by Amazon. If you're producing a file for distribution by Amazon, you only need the epub file.

• Turing_Machine 6y ago
  However, Kindles can't read epub directly. If you're trying to produce a file you can sideload on your (or your customer's) Kindle without going through Amazon, you're still gonna need mobi, or one of the later proprietary (and undocumented) Amazon mobi variants.
  • Finnucane 6y ago
    True, but I wouldn't count on that being supported forever.
    • Turing_Machine 6y ago
      The day Kindles stop supporting side-loaded third-party content is the day I stop buying Kindles.