Differences between the OpenDocument Text (.odt) format and the Word ...
OpenDocument (.odt) files are compatible with Word and open source applications like OpenOffice and LibreOffice, but you might see formatting differences and some Word features aren't available in .odt files. Word documents (.docx) are compatible with most applications.
Applies To:
Word for Microsoft 365, Word 2021, Word 2019, Word 2016