MAPI_USE_DEFAULT
const mapi.MAPI_USE_DEFAULT;The messaging subsystem should substitute the profile name of the default profile for the lpszProfileName parameter. The MAPI_EXPLICIT_PROFILE flag is ignored unless lpszProfileName is NULL or empty.
The messaging subsystem should substitute the profile name of the default profile for the lpszProfileName parameter. The MAPI_EXPLICIT_PROFILE flag is ignored unless lpszProfileName is NULL or empty.