@VirgoGirl-
You might check to be sure that when you do your mobi conversion in Calibre that you have selected the output to be 'new' instead of 'both'....the 'both' setting will give you a book file that includes both 'old' mobi and 'new' AZW3, hence twice the size.
Last edited by GoSharks; 09-14-2013 at 10:57 AM.
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