To be honest, the same sort of thing happened in my company, only in reverse. We deployed Exchange 2007, which already has built-in push-email capability as you know. We had that set up and everything, and then the CEO got a Blackberry Curve and wanted it to work with his e-mail, contacts, and everything...he was quite enchanted with the device. His decision, we bought and implemented BB Professional ("BES Lite").
Then, at the next quarterly meeting, he pointed out that we had to start keeping an eye on spending and save money where we can. :lol: So anyway, we didn't exactly ditch Exchange ActiveSync, but we invested in something else to get functionality similar to what we already had. Primarily because Blackberries only work with Blackberry Server (or Intellisync Server anyway).