Originally Posted by Loeffel
Anyway, First I do not understand, why you're converting the RTF-file with libre office, just open it with Office 2003/2010 as they both can read it. There you can work with them and then save them as RTF (to come back into Calibre) and DOCX.
The reason I am using LibreOffice is that I don't have Office 2003/10. I am doing the same steps that you mention, only in LibreOffice instead of Word. Sorry that I wasn't clear on that one.