Not so. There are and always have been two options for sorting the Outlook
Address Book:
1. First, Last
2. File As...
The latter almost invariably sorts by Last Name.

--
Russ Valentine
[MVP-Outlook]
"Castell" wrote in message
...
The order is in alphabetical order by Full Name (ie. essentially by first
name). You cannot change this.

"Patrick" wrote in message
...
I have created & named folders to store email names & addresses in
Outlook.
I have sorted them alphabetically by last name in the “email display as”
column. But when I open them when sending email in “to:” they are not in
alphabetical order. What do I need to do?
--
Patrick