With CRM 4.0 - when composing a new email from the Outlook client, you can click the "TO" button to pull up the Address Book. I can choose which Microsoft Dynamics CRM Address Book (CRM Account, CRM Contact, CRM Leads, etc) to use from the Address Book dropdown. When I choose "CRM Contact" I get a blank list. When I choose any other (CRM Account, CRM Lead, etc) I get list of CRM records to choose from.
Any ideas on why the "CRM Contact" address book would be blank?