Originally Posted by dwig
You should also consider that the vast majority of users, unlike the population here at MR, will not understand the difference between Classic MOBI and KF8 and thus giving them a choice will only be confusing. You should post single hybrid files leaving the user with only two choices; ePub and Kindle/MOBI.
I'm not suggesting for a moment that azw3 will replace mobi in the near (whatever that means) future. And if we do start providing azw3 ebooks as well as mobi ebooks it will be a trivial task to put something up like bookname.mobi (for Kindle 3) and bookname.azw3 (for Kindle Touch and Kindle File).
Part of the reason for my initial query was to ensure that there would be minimal confusion for users of the MobileRead library.