Why buy dropbox when it is cheaper and easier to just fix some of the problems with the existing MobileMe service? Stealing a page from dropbox and similar services, Apple should just make a basic MobileMe account free and let you buy additional services as needed. The service is already integrated into the desktop OS, it is partially integrated into the iPhone OS, and if they just added some polish and back-end resources they would have a decent start towards cutting off Google encroachment into their platform.