What Micro Focus products are required to do remote debugging?

Problem:

MAPILogon returns 3 when used with the COBOL Multi Threaded runtime.

It may work sometimes but if invokes are performed to any COM object before the MAPILogon call then you will always get a -3 returned.

Resolution:

You need to perform an:-

invoke olesup "singleThread"

so that the COBOL runtime initialized COM with CoInitializeEx(0,COINIT_APARTMENTTHREADED).

If this call is not made then the runtime will initialize COM with CoInitializeEx(0,COINIT_MULTITHREADED).

Microsoft's MAPI api is not compatible with COM initalized with COINIT_MULTITHREADED and has to be initialized with COINIT_APARTMENTTHREADED. Using the single threaded COBOL runtime also avoids this error.