Been there, done that. We use Lotus Notes, and mapi32.dll is installed. Additionally, we modify teh win.ini folder to point to the proper dlls to take care of this issue:
[Mail]
MAPI=1
CMC=1
CMCDLLNAME=mapi.dll
CMCDLLNAME32=mapi32.dll
MAPIX=1
MAPIXVER=1.0.0.1
OLEMessaging=1
That's why I was...