Word 2016's equation editor allows direct entry of latex equations.
On one of my computers (running Office 2016 Professional), the latex button does not stay pressed. My other computer, running Office 360, works fine, so my expected behaviour is valid.
I have reinstalled office, purged the registry, and done everything else I can think of. The editor will not stay in latex mode.
(NB: was directed here the Tex community.)