The OP is a bit confused about the fundamental purpose of Calibre. Somebody correct me if I'm wrong, but Calibre offers NO readers for portable devices. It is primarily an ebook catalog tool which also means that it "just" reads a database. (I use the word "just" with tongue firmly in cheek, because there are far more uses for it than cataloging ebooks, but none include a reader for *any* portable device.) To support this primary function, there are many subsidiary functions, such as conversion from one ebook format to another, creating new ebooks, or editing/polishing older ebooks.
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