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First off this topic is getting way to fucking old.
Next AIM and ICQ are 100% compatitable. ICQ can message AIM users and AIM can message ICQ users.
Then many of us have been using ICQ for decades and do not wish to try to move over entire contact lists. Others use trillian which combine most all of them. People like myself use nearly all of the messagers aside from skype and I personally prefere Gtalk. However to answer the question, for the longest time ICQ was the main standard and only one with a history and ability to leave messages when people are offline.
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