title: AppointmentItem.UserProperties Lost on Recipients Not in Organizer's Domain
body: <p>Outlook 2010
  Setup: 
      Exchange Account #1 (Domain A)
      Exchange Account #2 (Domain A)
      Exchange Account #3 (Domain B)</p>
  
  <p>Windows 8 Enterprise machine. I am logged into Domain A. I get receive/send email on all Exchange accounts. Whenever I create a meeting request the custom user property values are not read by Exchange Account #3. There are null or blank values.The code is suppose to populate for region controls on this.FormRegionShowing event. The 2 domains are federated with each other. I am stumped. </p>
  
  <pre><code>Textbox1.Text = (string)appointmentItem.ItemProperties[PropertyVariables.Property1].Value;
  Textbox2.Text = (string)appointmentItem.ItemProperties[PropertyVariables.Property2].Value;
  Checkbox1.Checked = (bool)appointmentItem.ItemProperties[PropertyVariables.Property3].Value;
  </code></pre>