How did you configure the sorting of the Outlook Address Book?
Tools > E-mail accounts > View or change existing directories or address
books > Outlook Address Book > Change. > Set your sort order there

Signature
Russ Valentine
[MVP-Outlook]
> We have a xp version, and cannot search names in contact
> list by last name, only works with first name.
>
> Can anyone assist me with how up set up xp outlook to
> search last name.