Hi NicolaNY
Something you need to be aware of, which was brought to my attention a while ago by Hitch, another (extremely knowledgeable) poster here on the MobileRead forums :
Quote:
Originally Posted by Hitch
I know that Calibre can and does generate an html toc when you convert from ePUB to mobi; but that first-generation mobi isn't saleable on Amazon, as Calibre's mobi's don't leave enough room in the headers for K4PC's second layer of encryption.
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Basically, if you want a DRM'd Kindle ebook to be readable using the Kindle for PC application, you can't use a MOBI file created by Calibre. It's fine if you're just creating a MOBI file for your own use on a Kindle, or (as far as I know) if you intend to publish the ebook on Amazon without DRM, but not really ideal if you intend to use DRM and intend it to be a commercially viable ebook available for sale with Amazon, I'm afraid.
If the above applies, you really need to use Kindlegen to create the final MOBI version that you upload to Amazon.
Note: the quote above dates from Nov 2010, but to the best of my knowledge, the info it contains is still accurate.