You can maintain contact information in the Address Book. To create a new contact, you can access the Address Book and define a new contact from scratch, or you can add a message sender directly to the Address Book.
Follow these steps to create a new contact:
Open the Address Book.
Click New Contact located on the Address Book tool bar.
Enter the contact's first name, last name, and display name (which is used in the display list to identify the contact) in the Personal Information section.
Enter an e-mail address for the contact and any other information that you want to preserve about this person on the New Contact scree.
Note: If you are adding the contact directly from the e-mail message, the sender's e-mail address will be automatically filled in.