outlook contacts in address book

I use outlook 2002 and 2000 at work. By default when you open a new email message and click on the "TO" button it brings up your address book which we have our contacts as our default. The problem is that we have many names in our contacts and mosthave 2 entries: the first being their email and the second their fax number. At present we cannot fax from our local machine due to hardware and telephone limitations. Is there a filter or a registry entry that we can use to only display the emailaddress, thus causing less confusion for those with minimal computer skills such as our CEO.

Any suggestion would be appreciated.
Baegis