Can I make the Address Book show only email addresses, not fax numbers?
Outlook considers fax numbers to be valid e-mail addresses. If you want to send both e-mails and faxes from Outlook, there’s no solution to this issue. If you are keeping the fax numbers just as a matter of record, though, and don’t use them in Outlook, then you can choose one of the non-fax phone number fields to store the fax number information. Unfortunately, you can’t change the names of the built-in fields; you would need to remember which field contains fax numbers. Another approach is to put text in front of the fax number, such as “W:” for a work fax or just “Fax:”; this causes the number to disappear from the Outlook Address Book, but keeps it easy to see the number in the contact record or Contacts folder.