I doubt that many people need what is offered in the pricy office suites.
I consider the real-time spelling and grammar checking in MS Word to be worth the pricy price. If they add that sort of thing, and more compatibility to MS Office, to OpenOffice and someone comes up with a really viable Outlook clone and a viable MS Project clone, then Microsoft should start sweating. It's not the desktop that is keeping corporations away from Linux. It's the applications. Specifically, MS Office, MS Outlook, and MS Project, that businesses don't want to give up.