MAPIInitialize() fails with MS outlook 365

Question

Hi

I have an VC++ application which reads the emails from the MS outlook.

Till now it was working fine till I was using MS outlook 2019/2016.

But as soon as I upgraded my outlook to office 365 app, my application fails with outlook.

below is the code chunk:

LPMAPISESSION			m_pSession;

MAPIINIT_0 MAPIINIT = { 0, MAPI_MULTITHREAD_NOTIFICATIONS };

	// Initialize MAPI
	flags = MAPI_NEW_SESSION | MAPI_USE_DEFAULT;
	hr = ::MAPIInitialize(&MAPIINIT);
	if (SUCCEEDED(hr))
	{
		hr = MAPILogonEx(0, NULL, NULL, flags, &m_pSession);
	};

The API which is failing is MAPIInitialize(). Now it is returning error code 127 (The specified procedure could not be found.)

Environment is Visual Studio 2019/2022, I tried with both.

Please suggest is there any change in the libraries of MAPI for outlook 365.

32-bit compilation is only I am trying to run, but I did compiled in 64-Bit, there I was getting the error "fatal error LNK1112: module machine type 'X86' conflicts with target machine type 'x64'". So I switched back to 32bit. Any idea how to get rid of this error in 64 bit compilation?

Kindly help, my application has stopped working and need guidance.

Thanks in advance.

Answer 1

Perhaps you can use Stephen Griffin's MAPIStubLibrary in your project. https://github.com/stephenegriffin/MAPIStubLibrary