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Thanks to Adium I finally could ditch the old crappy ICQ. iChat did not work for me because of cyrillic letters (not supporting them). Now with Adium I can chat with ICQ and MSN users. What I miss is video/audio integration and possibility of screen-sharing. Another issue is that I cannot see the user profile of someone who sends me an invitation. So I cannot decide if this is spam or a real user.
So thanks a lot to the developers of this great program, which I use quite every day.