Currently, we are running Blackberrys within our Exchange '07 rollout, and they work fine. Two admins (myself and another chap) are concurrently running BB and SmartPhone - he an i730 and me the i760. Since the i760 is brand spanking new (released November 1) what patch(es) do we need to install on it to make it do the new voodoo that we would want it to do? What is so different about SP1 that we have to change / upgrade the phones?
The SmartPhones work just as fast as the Blackberrys without the risk of having RIM go down. Cost for the phones is comparable at the enterprise level, and you don't need a BES running. At this point, it is a no-brainer, both from a business standpoint as well as a technical support / maintenance view.