>I (I should say we, our office PB app does this too) use MSMAPI OLEcontrol MAPISession for sending both automated and manual messaging using Exchange. We will be upgrading to Outlook 2000 soon, and I'm having trouble obtaining a test installation from our LAN people, I gather it's not a simple upgrade in an Exchange Server environment.
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>Anyway, will our MSMAPI Exchange code work directly with Outlook 2000, or will it need a major overhaul? There is a lot of code we're talking about here...

We're using Ex5.5 w/OL2K and I have at least one VFP app successfully using the MAPI controls and a VB app too ( horrors :-), just kidding, it's actually a pretty nice application ). But you know how it is with upgrades ... :-) Personally, I think I'd rather instantiate OL objects directly and use 'em if possible, but others may disagree ... and if you have a lot of code to port ...