Originally Posted by BeccaPrice
any reason why, Harry?
I don't really care what the format is, as long as the renaming plugboard will work - it's the only way I can keep track of series.
It's a "richer" format. Books in AWZ3 format support more complex formatting - embedded fonts, drop caps, etc. Of course a particular book may not use such formatting, but if it does (eg in an ePub), AWZ3 will preserve the formatting, whereas Mobi won't.