I don't think the Office leak is a bad thing for Microsoft, especially considering its just a leak of the beta. Professional users will never use pirated software in their business environment. If anything, this just gives Pros a chance to try out the software at home, get to know and like the new features, and then beg their IT departments to upgrade.
Funny.....My local Wal-Mart has an ad poster at the front door advertising a release date of Sept 22 for Halo ODST. And then of course there's here. http://halo.xbox.com/ so how is this considered a leak?