Hi Diego,
you can only sort by "first name, last name" or "last name, first name".
http://office.microsoft.com/en-au/assistance/HA010565141033.aspx
No other settings are possible.
--
Oliver Vukovics
Share Outlook without Exchange: Public ShareFolder
Share your contacts, calendars or e-mails
http://www.publicshareware.com
> How do I sort the selected names list that appears when I click on "To:"
> on
[quoted text clipped - 3 lines]
> in
> the contacts list).