Can't, there's one big reason why they won't move to openoffice for some time: zero CSR support.
Openoffice need self productive people who understand how to fix or research to find out how to do something. Average newbie at corporate job has little accounting/database PC experience these days.
Dumb people with no IT backgrounds call for help to Microsoft all the time. I seen it often at my past jobs, stuff I can just tell them how to do it if I wanted to.
Also for some of the pros they rely on the macro functions in word and excel now. They programmed a bunch of stuff with that and openoffice can't do that yet.
