Caibre is a much bettercollection manager than the sony library, you will have a problem loading kindle books to a sony reader as they tend to be DRM locked and then cannot be changed into a different format (apprentice Alf may help).
You can also get unlocked books from ebay, baen books, gutenberg etc.
Calibre cannot convert books that have DRM on them this includes public library books, these however can be read on sony devices as they are in EPUB format
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