Interesting regarding pushing email from MS Exchange 2003 SP2. I know with us being a Lotus Notes shop, if would actually be nice to still have a MS Exchange server around. I know a lot of our back end stuff can be made to work better with Exchange (for alerts and mail integration) and with Domino unfortunately (our ERP and CRM packages for example) than with Domino. And if we could leverage that instead of something like a BES server, and support a wider variety of PDAs, then all the better. We could leverage exchange to work as glue between Domino and some of the newer stuff.

We'd be a few years off from dumping Domino completely. MS hasn't replaced all of the functionality of Notes and Domino with its various tools. Although Exchange + IIS (threaded discussions) + SQL + Sharepoint + Outlook + IE gets you darn close.