Ken, lately, for the few luckily infrequent times that I need to share a document with a Word user, I have found that exporting to ODT is sufficient. ODT documents can be loaded in (recent?) versions of MS Office although the latter complains that the document is corrupt but is able to "fix" it... Equations, in particular, come through as well as I could expect.
-- : Eric S Fraga (0xFFFCF67D), Emacs 25.0.50.1, Org release_8.3.3-531-g8003ef
