TaskManager allows you to view the history of a selected work item. To do this:
On any mailbox page, select the checkbox to the left of the work item name.
In the navigation pane, expand the Actions menu and then click History. A Work Item Report page appears in a separate browser window.
The Work Item Report page displays the work item name, the activities where the work item has already been processed, the name of the actor who completed each activity, the time when the work item began at each activity, and the amount of time that the work item spent at each previous activity or has spent at the current activity.