I'll be honest; Sigil's "Clean Source" upon opening may very well close the tags on mobi6|7 markup and make it valid xhtml, but it might not look anything like the book did when it was a mobi.
But if you just want to "let 'er fly." Most mobis unpack into everything you need to slap together an ePub (html, opf, ncx). There's some python code in KindelUnpack that should help you zip up all the files in the correct manner--and create the mimetype/container.xml files.
Last edited by DiapDealer; 05-13-2014 at 05:21 PM.
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