During a busy shift at the help desk at Litware, Inc., a call comes in at 9:05 AM from an angry user whose mouse is not working. At 9:07 AM, the vice president of the Marketing department calls to report that the hard drive in the file server where the company's ad campaigns are stored has failed. At 9:15 AM, the manager of the Order Entry department calls to report that the email server that delivers the product orders generated through the company's web site is down. Between 9:25 and 9:45 AM, four users on the LAN in the Sales department call to report that they cannot access the company intranet server containing the health insurance forms they need. As the help desk manager, which of these four problems should you address first? Explain your answer, and why you did not choose the other three.