The best thing you can do at these temperatures is to convert .docx files to epubs - others will do the job!
And the plugin does it incredibly well! For the first time, I used the "dialogue check", and this is reaaally helpful, as the spellcheck in Word doesn't recognise errors in this area. My problem: The dialogue check also shows error messages in realation to - hm, don't know the word in english - " ' "-signs. It might be called single quotation marks, and that's it. Just as in english, it is in german frequently used not as quotation mark, but as symbol for letting out a character, especially an "e" (for example: "geht's" for "geht es"). Is it possible to eliminate the warnings for those cases?
Ah, and is it possible to check an option for editing the created ebook either in Sigil or in the Calibre Editor? - Thanks a lot!