Il faut Mac OS X.2 pour l´utiliser :
What are the requirements to use Adium?
Adium requires Mac OS X 10.2 or higher ( "Jaguar" or better) to run. Certain features ( WebKit Message Styles, log content searching, and tab dragging animations) require Mac OS X 10.3 ( "Panther").
http://www.adiumx.com/faq.php