Close Outlook, open ACT!, and log into your ACT! database using your ACT credentials.
1. Choose Tools > Preferences
2. Choose the Email\Outlook Sync tab
3. Choose the Email System Setup button and go to Step 3 of the Wizard.
4. If you don’t have an Address Book listed, this is the cause to your problem. Choose Add and enter the user's login credentials. Finish the wizard using the defaults.
5. If you do see an Address Book listed, remove and re-add the addresses book. This will most likely fix the issues you are having. Again, finish the wizard using the defaults.
6. Restart Outlook and retest.