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PidLidTaskHistory Canonical Property
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Indicates the type of change that was last made to the task.
Long ID (LID):
When the value of this property is set, the dispidTaskLastUpdate (PidLidTaskLastUpdate) property must also be set to the current time. The following table shows the dispidTaskHistory property values, listed in order of decreasing priority.
The dispidTaskDueDate (PidLidTaskDueDate) property changed.
Another property was changed.
The task assignee accepted this task.
The task assignee rejected this task.
The task was assigned to a task assignee.
No changes were made.