- WebDav, Store Events, CDOEX and ExOleDB all say hasta la vista in the next version of Exchange. Universal replacement: Exchange Web Services
- MAPI's not dead yet. The Exchange team's going to stop working on MAPI client binaries, but the server itself remains a MAPI server. Outlook will still use MAPI to talk to the server and you can too. You'll just be using Outlook's libraries or the raw ROPS.
- CDO.dll is practically dead. This binary has always been owned by the Exchange team. Even when Outlook shipped a version, it was built by Exchange. Now is the time to start migrating those CDO based apps!
I've been playing with the next release of Exchange Web Services here and I gotta say the updates they have planned are pretty sweet. This API is well on it's way towards being a complete replacement for MAPI.