The PR_ACKNOWLEDGEMENT_MODE property contains the identifier of the mode for message acknowledgment.
| Header file: | MAPITAGS.H | 
| May be exposed by: | Message objects | 
| Identifier: | 0x0001 | 
| Property type: | PT_LONG | 
| Property tag: | 0x00010003 | 
| Corresponding X.400 attribute: | IM_ACKNOWLEDGEMENT_MODE | 
The PR_ACKNOWLEDGEMENT_MODE property can have exactly one of the following values:
Message Properties, PR_MESSAGE_CLASS