VSTO exposes no Outlook events. The Outlook object model exposes the
Explorer.SelectionChange() event that returns a 1-based Selection
collection. Any items in that collection are selected. Use that on the
ActiveExplorer() object.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"Saeed" wrote in message
...
I am writing a plug-in for outlook using VSTO in which I want a toolbar
button to be enabled only when one or more email messages are selected,
and
disabled/grayed otherwise. For which I need the event as soon as a message
is
clicked, and as soon as a selected message is deselected. Does VSTO expose
such an event.