Quote:
Originally Posted by eschwartz
MOBI == old (legacy) mobipocket 7 format.
AZW == renamed .mobi, and binary duplicate
AZW3 == new mobipocket 8 format, also known as KF8. Adds support for embedded fonts, CSS3, and much much more. Feature-matches EPUB2/3.
Send-to-Kindle requires you submit either an old MOBI or a dual-MOBI (with combined mobi7 and KF8 sections) for backwards compatibility with old devices.
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Thanks eschwartz, I think according to the pdf or epub I should try both mobi and and azw3 to catch better format on Kindle. Haven't got into Calibre very well yet, I think the more I use the more it will be better.
Actually yes I was trying to send pdf files via email to my kindle and it failing all the time, I don't mind to do it manually.