No full versions of Outlook ever had the ability to add recipients
automatically to your Contacts Folder. Only the long abandoned IMO mode of
Outlook 98/2000 did that. To automatically add the email address of people
you respond to to your Contacts Folder requires code:
http://www.outlookcode.com/d/code/autoaddrecip.htm
http://www.slipstick.com/contacts/addauto.htm

Signature
Russ Valentine
[MVP-Outlook]
> How do I automatically add email addresses to which I reply to my contact
> list?