The bad thing about corporate users is that have special needs, the good thing is that are willing to pay for a service. Maybe somebody should start selling that service (in the form of a "package", "mediawiki distro", or other mode).
My company uses GoogleDocs, but we are developers, so we don't have the mindset of the people that share photos inside .doc files. Apparently you can embed googledocs in html. http://en.support.wordpress.com/google-docs/
It would be natural for us to find a way to embed google docs in a wiki,... but we don't need to, because a simple link is enough.