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To configure Outlook to use the VPOP3 global address book, go to Tools → E-Mail Accounts in Outlook

Then choose Add a new directory or address book and press Next

Choose Internet Directory Service (LDAP) and press Next

In the Server Name box type the name or IP address of your VPOP3 computer. By default, VPOP3 doesn't require you to log on

Press Next and then Finish

Now if you go to Tools → Address Book in Outlook, you will be able to choose to see and search for names in the new directory service.

If you press Tools → Options in the address book in Outlook, you can tell Outlook to search for names in the various address lists as you are typing them when sending mail.