Your post is very vague. Shall we assume you are not referring to Contacts
at all, but instead the Outlook Address Book view? If so, this is behavior
as designed.

Further to Ross's reponse - what you are encountering is by design in the
address book - ergo one entry for each valid "electronic" means of
communication which in this case is one for email and one for fax. If you do
not wish to see the fax number included, which am going to assume is the
real question being posed, need to alter the fax number (within the contact
record - not the AB) in some fashion (i.e. add an alpha character in front
of the phone number). There are also 3rd party utilities you can purchase
that deal with this issue but unfortunately don't have current URL's handy
for any of them - should be able to find one via a google search or someone
else may respond with additional info.

Karl
___________________________________________________
Karl Timmermans - The Claxton Group
ContactGenie - Importer 1.3 / DataPorter 2.0 / Exporter
"Power contact importers/exporters for MS Outlook '2000/2007"
http://www.contactgenie.com