How to add a button in MS Outlook 2007 Navigation Pane

Hi,

I am developing an outlook Addin using VS 2005. I am using outlook
2007.

I want to add a button called "Publication" in the navigation pane of the
outlook 2007. Onclicking of that button, I want the list of all e-
mails which come from Publication Group to be displayed.

Is it possible to program navigation pane in MS Outlook 2007?

Regards,
Vishal.