The biggest changes:
- total freebie, no licensing
- runs right on the Exchange server or SBS server
- runs on 64-bit and supports up to Windows Server 2008
From my perspective this means we can start installing BES right on the SBS box and save our clients a Windows Server license fee and hardware costs. In some cases, it will mean we can retire an old box that was being used just for BES.
While I think of this from the perspective of our smaller clients. It is scalable up to 2000 users on a dedicated box. There are a number of policies and add-ons that don't work with BES Express, but if all you need is the basic e-mail, calendar stuff. This one is a winner and helps compete with ActiveSync on the iPhone which is effectively free.