Specifies an optional MAPI Address Book that the MAPI to MIME converter uses to resolve ambiguous addresses when converting a MAPI message to a MIME stream.
[in] Pointer to an IAddrBook interface to be used in the MAPI to MIME conversion. Set this parameter to NULL when you no longer need the Address Book; this releases the interface and resets the converter to not using any Address Book.
The function call is successful.
Converting a MAPI message to MIME stream generally does not require logging on to a MAPI profile. However, specifying a MAPI Address Book for conversion requires logging on to a profile to obtain the Address Book.