@Dr Herbie: Businesses cannot legally buy the Office 365 Home product mentioned above. It has a "no commercial use" licence. See here. So I am contrasting Office 2010 Home with Office 365 Home.    

The business subscriptions haven't been completely released yet. They seem to exist as they're referred to all over the place, but if you actually look at the business offerings they don't yet include Office (software) in them.