Suggested Contacts was created for this group of people - they won't lose their addresses and the automatically saved addresses won't clutter up the 'good' Contacts folder. Except the autocomplete list corrupted easily. In older versions of Outlook, a lot of users stopped creating contacts and just used the auto-complete cache as their address book. It's just a cache of recently used list of addresses. The Autocomplete list contains the addresses that come up when you begin typing in the To field. This is expected, since it's just the 'box' your other address lists are stored in. When you select Outlook Address Book, it will say that there are No entries in this Address Book. Note: The top level listing ' Outlook Address Book' is the container that holds all address lists (for many people, Contacts is the only list). Outlook Contacts folders and GAL (for Exchange users) are the address books, cards, and scraps of paper containing addresses stored within the drawer.
The Outlook Address Book is a container that holds all your sources for addresses. I like to compare Outlook's Address Book to a shoe box or desk drawer where, in the past, we kept address books, business cards, and scraps of paper with addresses or phone numbers. It's not a 'real' folder or contact list, but a virtual view of all contact lists available to Outlook. The address book contains a list of all Contacts who have electronic addresses (a Fax number is an electronic address).