title: VSTO Outlook: Avoid MailItem_PropertyChanged from being fired when updating "To" field
body: <p>I am trying to update the 'To' field of an Outlook.MailItem but I want to avoid MailItem_PropertyChanged event to be fired so I unsubscribe from the event, update the 'To' field and then subscribe to the event again:</p>
  <pre><code>this.cryptableMailItem.PropertyChanged -= MailItem_PropertyChanged;
  myOutlookMailItem.To = something;
  this.cryptableMailItem.PropertyChanged += MailItem_PropertyChanged;
  </code></pre>
  <p>But it is not working, each time I update the 'To' field, MailItem_PropertyChanged is fired again and again.</p>
  <p>What am I doing wrong?</p>