MAPIFindNext

I wrote a application with Visual C++ to test the simple MAPI functions against Lotus Notes (6.0.1). The MAPISendMail works quite well, but:

MAPIFindNext returns MAPI_E_NOT_SUPPORTED(26)

That means Lotus Notes does not support MAPIFindNext, MAPIReadMail and …?

A hint about what I did wrong would be appreciated.