Adding or updating an Address Book entry directly from a message
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NOTE You are prompted to either update an existing Address Book entry or create a
new one only if the e-mail address you are attempting to enter into your Address
Book is different from the one already in the Address Book for the sender’s name. If
the name and e-mail address on the message are identical to the ones in your
Address Book, you see only a notification message that an Address Book entry
already exists for this sender.