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New Post: Help!! MAPILogonEx issue!!!

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Hello!

Could anybody help me with this problem:

I trying to write NT Service that works with MS Exchange Server. When I
call
MAPILogonEx() it returns with -2147221231 (ClassFactory cannot supply
requested class). but i call MAPILogonEx with administrator account, it success, What is the problem, what am i doing wrong?

here is my code:

HRESULT hRes = ::MAPIInitialize(NULL);

ULONG ulFlags = MAPI_EXTENDED | MAPI_ALLOW_OTHERS | MAPI_NEW_SESSION |MAPI_USE_DEFAULT;

hRes = ::MAPILogonEx(
    0,
    NULL,
    0,
    ulFlags,
    &_lpMAPISession);
Thanks in advance,

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