I just started looking into this today and basically had the same question. I currently have BlackBerry Professional Server (which is basically BES-smaller/cheaper) and somehow just learned about BES Express. It sounds too good to be true--free SRP and CALs up to a number way larger than what we'll ever need. Can you still get support contracts from RIM (or 3rd party)? (I will check their page, too, of course, but the Zimbra forums are always far easier to get information from!)
My additional question to "does it work?" is "does it work to migrate users from BES/BPS directly to the BES-express, or do you just have to enterprise activate users on the new server and start fresh?"
Also, it appears from the
BlackBerry Business Software Comparison chart that one does not necessarily need the BlackBerry Enterprise data plan anymore if you use BES Express. Perhaps the cost is not that different between a personal data plan and Enterprise data plan, but this would be good to know since part of enterprise activation troubleshooting always involved asking the service provider (T-Mobile in this case) to change someone from BIS to BES service, then having to call back and talk to someone competent to say "no, really, I mean it, you have to make that change for me or this activation is never going to work." Any experience with this out there?