| If you ever need to unblock a contact on AIM, simply follow the instructions below: 1. Within an ongoing chat window, click the Additional Options drop-down menu and then select Unblock This Person. 
2. If prompted with a popup window, confirm that you want to unblock the username. 3. To block someone again, open a chat with the person, click the Additional Options drop-down menu and then select Block This Person.
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