Configure the new installation to use the same data file.
The Help files tell you how.
http://office.microsoft.com/en-us/assistance/HA010771141033.aspx

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Russ Valentine
[MVP-Outlook]
>I just bought a new computer and I'm trying to transfer my contact list
>from
> Outlook 2003 on my old computer to the Outlook 2003 on my new computer.
> Help?