Contacts can be quickly added to your address books when you select an address on an email message and right-click to add the email address to your address book. Also, if you checked the Address Book Option to Enable auto adding of contacts, when you send an email to a new address, the address is automatically added to your Emailed Contacts list.
You can quickly add email addresses to your address books. You can add email addresses from mail header's From:, To:, Cc:, or Bcc: lines. You can do this from any message or conversation view.
When you pass your mouse cursor over an address, a tool tips displays the full email address associated with that name. If the name is already in an address book, both contact information is displayed. If the name is not in one of your address books, only the email address is displayed.

If you right-click on the address, a menu appears with the option to Add to Contacts. Click Add to Contacts to add the name to your contacts list. The contacts form displays the name.

You can add additional contact information and select which address book to save the contact information to.
An Emailed Contacts address book is automatically added to your mailbox. If you checked the Address Book Option to automatically add addresses, when you send an email message, if the address is not in one of your address books, the address is automatically saved to the Emailed Contact list.
The Email Contact address book lets you keep a separate miscellaneous address book from other address books with random addresses.