Autocomplete Email / Fax Error

I have MS Office Standard Edition 2003. I recently bought a new laptop,
installed my software and installed my old. PST file. Autocomplete was
working fine (box is checked in email options, all contact sub-folders are
checked in properties to show the folder as an email address book.

When I type a name or hit Alt-K to see a list, I now not only my contact
name's email, but their fax number as well. Is there something I have checked
that is enabling this?

Thanks