title: Outlook 2010 AddIn behaves weirdly when mail invoked from other office client
body: <p>I really need help with this one.</p>
  
  <p>I have written an adding that adds a some text to the subject line of an email on send it also sets the same value in a property on the email through the PropertyAccessor. This works beautifully when the email is created through the Outlook interface.</p>
  
  <p>The problem I have encountered is when a user is working with excel and decides to send the spreadsheet as an attachment from the Excel 2010 -> File -> Save &amp; Send -> Send as Attachment Menu Item.</p>
  
  <p>This will open the outlook 2010 mail editor as you would expect, the user can address the email and press send as normal and the email will be sent as normal. The problem is that the email editor does not close after sending as you would expect.</p>
  
  <p>I am using the Globals.ThisAddIn.Application.ItemSend event to make my changes to the email. I notice also on debug that this event fires a couple of times when sending. The cancel argument of this event is always false during execution.</p>