From the FAQ on the Stanza website, under the heading
How can I create ePub files from my books?
Quote:
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4. Calibre (http://calibre.kovidgoyal.net/): a free tool for Windows, Mac OSX, and Linux that allows you to convert to ePub from a wide variety of formats. Calibre currently does a better job than Stanza Desktop at preserving styles and formatting of source documents.
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(emphasis mine)