Here is a little update on the situation.
The customer had Outlook 2002 installed on the machine running my code. The
first user was able to connect but a second, concurrent user, got a
MAPI_E_NETWORK_ERROR from ConfigureMsgService. Individually or serially,
both users could connect.
The customer uninstalled Outlook 2002 and installed Outlook 2000 and
everything appears to work.
Does anyone know the difference of MAPI between the two versions? I didn't
think that MAPI changed. Has anyone else encountered problems with MAPI from
The OS in both cases was Windows Server 2000 SP3.