Outlook shows both the fax numbers (where present) as well as the email
 address when addressing an email. I understand that this was so you could
 send a message via either transport depending upon your contact.

 However, if you do not use fax on your system, then having the fax address
 displayed becomes a nuisance. Both because it displays an entry in the
 addressing dialogue window for each fax number configured as well as the
 email address, and when you expect Outlook to resolve the name
automatically
 it does not know which of the addresses for that contact you wish to use -
 showing the squiggly red line.

 It is possible to suppress the fax entry in the address dialogue by
 prefixing the Fax Number for the contact with a non-numercal character or
 string e.g. Fax: 01234 345 678.

 If you have a number of entries to manage in this way, then you may wish
to
 consider an add-in that will automate the task and allow you to select
such
 as that found at
 http://www.websetters.co.uk/WSAddIns/Fax%20Display%20Manager/Index.htm

 It resolves these issues by managing your contacts, hiding the fax entry
 when addressing emails but still showing the details in the contacts
folder.

Regards
Graeme
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