The only reason I can think of using MS Word/Open Office/Libre Office/whatever else... is for the spell check and I am sure there is at least ONE plugin for that among the 30,540 plugins on the land of WordPress.

One my clients posts on his own site (that I manage), I need to approve it, I get an e-mail on my phone.
I go check it that there isn't any spelling errors as his first language is not English.
Part of the support package he wants. I get paid thus not complaining.

Keith, curious: why a local install? couldn't you do it on your live site and install a spell check plugin?