The PR_PARENT_KEY property was originally meant to contain a value used in correlating conversation threads.
| Header file: | MAPITAGS.H |
| Identifier: | 0x0025 |
| Property type: | PT_BINARY |
| Property tag: | 0x00250102 |
| Corresponding X.400 attribute: | IM_REPLIED_TO_IPM |
Do not use this property. It is not supported in MAPI 1.0.