Microsoft Outlook 2003 Addresses/Contacts/New Message

Hi Friends,

When I compose a new message in outlook, and I click in the To: field and start typing someones name or email address, a list pops up quick and there it is..very nice. Question is: Where is this list come from and is this list accessable? It’s seems somewhat a list from my contacts,pab, and some others…Any help would be greatly appreicated!! Thanks much! Have a great day!