## ParentKey {#parentkey}

Contains the search key that is used to correlate the original message and the reports about the original message. Area: MapiEnvelope Canonical name: PidTagParentKey Alternate names: PR_PARENT_KEY, ptagParentKey

**Returns:** System::SharedPtr < PidTagPropertyDescriptor > Aspose::Email::Mapi::

```cpp
ParentKey()
```