Add an address to your address book You’re just a few easy steps away from ensuring the messages you want to receive are delivered to your Outlook 2003 Inbox. Note to users of earlier Outlook versions: Currently, Outlook 2003 is the only Outlook version that enables you to specify "Safe Senders". Outlook 2003: Do you need to Add an Address to another ISP? Click here to return to the e-mail client selection page and select another ISP. © Copyright 2005, UNISON.