AIM; nobody ever uses MSN in the states, except those who talk to foreigners... sure MSN has a few better features, but AIM has a few better ones too. MSN has convo logging and you can change your name any time you want, AIM has actual away messages and you can choose to reject being invited into chats. With addons that I have for AIM, including middle_man and DeadAIM, AIM definetly is my choice over MSN with or without addons.
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