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The default format used by Calibre for the Kindle is MOBI. Some users (like me) change that and set the default format to AZW3.
If users do this, AND disable MOBI as a format, then Calibre will convert your book to AZW3 before sending it.
Just tell people to not disable the MOBI format. AZW3 can be the default format, but Calibre will still send the MOBI file if that is the only one available, IF the format is enabled.
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