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I don't think it will be enough for most companies to migrate to hosted email, frankly, although it will certainly help make the case for it. Perhaps smaller companies, but Google is going to face significant competition from Microsoft Exchange services, which is already established. Plus, let's face it, MS has a long established reputation for providing services to enterprise, whereas Google is a relative newcomer on that front. Remember, enterprise is slow to move on most things, so it is going to take some time before many are ready to embrace hosted email. It is the same resistance that you see with some companies when it comes to fully embracing the cloud in other areas as well. It takes a long time for a moving ship to change course.