Bunches of people have contacted me asking if the MAPI download works with Exchange 2010. My usual response has been that I know it works, but you have to tweak the profile. I didn’t know the specific tweaks ‘cause I hadn’t looked in to it.
Dave Vespa just blogged those tweaks. Note that they’re very similar to the modifications we use with Exchange 2007 to get referral working. Also note that the profile Dave builds is not referral enabled, but this doesn’t matter any more. With Exchange 2010, MAPI always talks to the Client Access Server for both mailbox and directory. The dreaded DSProxy that we were trying to avoid in 2007 and earlier has been replaced by the Address Book Service, which is pretty much what DSProxy should have been.