When you combine most models of Kindle with this software, region lockouts become a thing of the past. Calibre will translate any format to most any other format, so your epubs, mobis and text files can all be moved around at your pleasure. Only question is whether it works with Kindle Fire; I have no idea.
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I take it back, looks like Calibre will work with the Fire. Actually, there's a pretty impressive list of devices:
At the moment calibre has full support for the SONY PRS line, Barnes & Noble Nook line, Cybook Gen 3/Opus, Amazon Kindle line, Entourage Edge, Longshine ShineBook, Ectaco Jetbook, BeBook/BeBook Mini, Irex Illiad/DR1000, Foxit eSlick, PocketBook line, Italica, eClicto, Iriver Story, Airis dBook, Hanvon N515, Binatone Readme, Teclast K3 and clones, SpringDesign Alex, Kobo Reader, various Android phones and the iPhone/iPad. In addition, using the Connect to folder function you can use it with any ebook reader that exports itself as a USB disk.
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