2.2.2.2.25 PidLidTaskLastUser Property
Type: PtypString ([MS-OXCDATA] section 2.11.1)
The PidLidTaskLastUser property ([MS-OXPROPS] section 2.323) specifies the name of the most recent user to have been the task owner.
Before a client sends a task request, it sets this property to the name of the task assigner.
Before a client sends a task acceptance, it sets this property to the name of the task assignee.
Before a client sends a task rejection, it sets this property to the name of the task assigner.