Outlook 2007 on Vista. Includes me when Reply-All

Hi,
My Outlook 2007 client on Vista includes me in the addressee list when I Reply-All.

Some relevant info might help
1. I have ONLY ONE MS Exchange email account on the Outlook 2007 client
2. I migrated the PST from my old XP from Outlook 2003 to my new Vista laptop with Outlook 2007.
3. My Outlook 2007 is connected to the company’s corporate MS Exchange server

Any pointers on the resolution?