Tasks can be reassigned from one user to another with this feature. It is currently available from the Action Bar of the Task Display form only.
When the “Reassign Task” button is selected, a pop-up window containing a drop-down menu containing a list of users appears. Select the desired user then click OK or Cancel. To notify the new Task Assignee via email, click the checkbox as shown below:
If the check box is selected, Outlook will launch with a new Email message to the designated recipient. The Task “Summary” field is copied to the message Subject and a link to the Task item appears in the message Body: