When I create a new email in Outlook 2007 and click the To: box to choose a
contact's email address I can't see my contacts email addresses.

In the Address Book field on the right of the Select Names box I've got a
choice of Contacts, Business Contacts, Accounts and Outlook Address Book but
none of these displays anything. Entering a name in the Search field also
doesn't produce anythting.

I transferred my email, contacts, etc from Outlook 2003 by exporting the
Inbox, Cent Items, Contacts, etc as individual .PST files and then importing
them in to Outlook 2007.

(The emails aren't being indexed either but I will raise a separate question
about this.)