Rehire Employee. If an archived employee (say an employee who resigned) is under active employment again (re-hired), you may go to , search for the employee (remember to change the Job Status on the Search panel to Archived), then Add a new Employment Terms record for him / her. This way the employee's historical records will all be kept intact and you will always know when the employee leaves and re-joins the organization again.
Don't forget to enable the rehired employee's Web Account again via