On the Extended MAPI level, you can look at the PR_MDB_PROVIDER propperty. I
am not sure I unxdderstand why you want to make a distinction - for all
practical purposes, caches Exchange mode is not at all different from PST.

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"gxdata" wrote in message
...
I can't locate any objects that will let me know whether Exchange is / can
be connected to Outlook 2003.
I want to deal only with a single-user (ie, not / never connected to
Exchange), so that I know to use local Contacts folders and not to use
offline or other Exchange-type addresslists etc.
I'm using VB.NET but anything that points me to a solution in VBA or .NET
would be much appreciated.

--
IL Thomas