Oh, and always create epub in Calibre from docx, never odt. Do an extra Save As if using LO Writer and never open the docx in Writer, only native odt. You can import a doc or dox but you need then to fix paragraph styles, character styles, page styles and headings, then save in odt.
Only create the dual mobi from the epub and after checking it.
Other wordprocessors and epub creation tools can be used. I don't recommend epub export from Writer (built in or plugin), Pages or InDesign. Sigil is good if you want more than an automatic docx to epub in Calibre. I have the styles, headings, fonts etc carefully done in LO writer so that the exported docx and then Calibre epub creation needs no editing.
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