You can do a bulk convert of all your books to AZW3 in Calibre. That's what I did after I got my PW2. I just set the options that I wanted for my AZW3 files and set it bulk convert. It took a while, but I just let it run until all the books had converted. If I remember correctly, there were a couple books that gave me errors and didn't convert, but all the others converted flawlessly.
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