Does anyone know if "Publish from Office" addon will be available for Epi 9?
Probably...when they get the time to upgrade it. There are a few addons like CMO etc that are lagging behind from 7.5 so I'm guessing they are somewhat busy in that department :)
Maybe someone at Epi has a roadmap for them?
in CMS9, ContentChannel and its supported classes, UI were totally removed without a similar class for switching to
Publish from Office depend heavily on Content Channel.
I don't know any plan for ContentChannel on 9, so honestly, I don't know when is OfficePublish available for CMS9.