Converting .docx documents to .epub format.
Converting Microsoft Word Documents directly to Open eBook Files (.docx to .epub conversion) is certainly possible and quite straightforward.
Use software, such as iStonSoft ePub Converter, for instance.
Alternatively, you can try using some word processors or page layout software.
Professional desktop document publishing software from Adobe
A shareware word processor program
A free e-book library management application
A program for ePUB conversions
A word processor and layout tool marketed by Apple
A text to epub converter