Originally Posted by marshap
Is there a way to determine if an epub ebook is the original format, or if it was converted from mobi or some other format?
If the time stamp does not help:
use Tweak to explode the book and look at the end of a chapter with an editor
if you see a line similar to this
<div class="mbppagebreak" id="calibre_pb_36"></div>
was a (Calibre?) Mobi at some time in its life