If the Outlook Address Book service has not been added yet, press the New… button.If the Outlook Address Book service is added already, you should mark your Contacts folder as an Outlook Address Book.Outlook 2010 / 2013 / 2016 / 2019 and Office 365įile-> Account Settings-> Account Settings…-> tab Address Books.Tools-> Account Settings…-> tab Address Books Open the Address Book lists for your mail profile.You can add this service in the following way. Outlook can only show contacts from your Contacts folder(s) in the Address Book when the Outlook Address Book Service has been added to your mail profile. Make sure the Outlook Address Book service is added to the Mail Profile Make sure that the Contacts folder is marked as an Outlook Address Book.Make sure the Outlook Address Book service is added to the Mail Profile.This guides lists the two things you’ll need to check and set correctly, and offers a solution in case that fails. When trying to use the Address Book to address a message to a contact, you could find that the contacts from your Contacts folder aren’t listed.