Look at the Application.Inspectors.NewInspector event. It will not let you
cancel the action.
You can also trap the MailItem.Open event (which is canceable), but that
means that you will need to set an an event handler on each selected
messages and track the selection by using the Explorer.SelectionChange
event.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
"John" wrote in message
...
Hi

I am trying to write an add-in in vs2008 for OL2003. Is there a way to
trap the item open event i.e. when a mail item is opened by user? This is
to give user choice of either opening the mail item as normal or allow the
add-in to do something else to the email?

Thanks

Regards