Try this:
http://www.york.ac.uk/services/cserv/help/mail/access/outlook/address/lostaddressbook...

No Contacts visible in Outlook Address book

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If you can see your Contact information in your Contacts folder but
are unable to see them when selecting Tools | Address Book... follow
the instructions below:

Open Outlook and choose Tools | Email Accounts...
Click on Add a new directory or address book, then Next >.
Select Additional Address Books then click Next >.
Choose Outlook Address Book from the list of additional address book
types, then click Next >.
You will be prompted to close Outlook and reopen it for the changes to
take effect.
Open Outlook and right click on the Contacts folder on your Outlook
Today shortcuts.
Choose Properties.
Click on the Outlook Address Book tab.
Check the Show this folder as an e-mail Address Book box.
Click OK and check you can see your contacts in the address book by
choosing Tools | Address Book...