2.2.8.2 PidTagAddressBookHierarchicalParentDepartment
Data type: PtypEmbeddedTable ([MS-OXCDATA] section 2.11.1)
The PidTagAddressBookHierarchicalParentDepartment property ([MS-OXPROPS] section 2.541) contains a Department object that references all of the departments to which this specified department is a child department.