In office 365, word has dozens and dozens of grammar thingies that are
checked. I worked through this with MS accessibility support. Go into
options and down to proofing. Un-check use check grammar in the editor. Then
tab past grammar to settings and select it. You'll find a list of 174 items
that are checked. Uncheck all of these and ok the whole thing and spell
check will work but you'll have to be patient.
