How do I enable the MAPI subsystem in Outlook 2003?

[Gary]

We've built a small VC++ automation app.
Works with Eudora but not Outlook 2003.

MAPISendMail() fails MAPI_E_FAILURE

CDO is installed.

Thanks,
Gary

 

[Dave Calkins]

Experienced the same problem here. The below fixed it.

1) the attachment info (specifically the position argument) was not being
passed correctly. You need to pass in the below:

mfd.nPosition = (ULONG)-1;

2) we were using the login/logoff to create a new session and apparently
Outlook didn't like that; now we skip those APIs and just pass in NULL for
the session.

Dave