Yes, that is what I thought too. But isn't it possible if someone code the open source so well while keeping the security levels intact? I guess there must be some solution to it in near future if there is nothing as of now.

I guess in time that would happen but then again there are the few features which MS Office will always have that others won't (at least in terms of compatibility when content is shared to others outside the organization).

Open office and google documents are quite awesome. I have ms word on my laptop and transfer and use files to my pc(uses open office and google documents. I haven't really needed or missed any of the extras ms has but liked the cloud storage of google doc)