No thanks, I will use google docs
Edit: Microsoft does not yet realize the threat it has from OO of google docs. Google did not give a limited capability search for free users. I read in one of PG's essays, "Get all the users and advertisers will follow. I can only see a half hearted effort from Microsoft, which will never capture all users. I would rather prefer full functionality OO compared to half functionality MS office.
It would be nice if MS said what type of ad would be shown (banner ad in toolbar à la Opera would be good).