title: When is a MailItem not a MailItem?
body: <p>I have written a message handler function in Outlook's Visual Basic (we're using Outlook 2003 and Exchange Server) to help me sort out incoming email. </p>
  
  <p>It is working for me, except sometimes the rule fails and Outlook deactivates it. </p>
  
  <p>Then I turn the rule back on and manually run it on my Inbox to catch up. The rule spontaneously fails and deactivates several times a day. </p>
  
  <p>I would love to fix this once and for all.</p>