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Q: 

MSMapi32 works with 'Negotiate' authentication, but doesn't work with NTLM or Kerberos.

My application uses msmapi32 to connect to Exchange server and download incoming messages. If I use Negotiate authentication in mapi profile, everything works fine, but other options fail. I get a non-descriptive error when calling 'm_session.SignOn();' method.

AFAIK, Negotiate just chooses between Kerberos and NTLM, so I'm confused. Also, I've tried all these authentication protocols using the same mapi profile in Outlook and it works.

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