Hiya!
I have searched keywords for this issue I'm having but can't find the solution already on here, so here goes...
I have installed Adium v 1.0.6 on my Mac 10.3.9 and so also installed Growl 0.7.6. I have customised the preferences in Adium so that I am notified of any new mail that arrives in my hotmail account with visual notifications as per the http://trac.adiumx.com/wiki/GrowlInAdium and it still isn't working. Adium is listed in the Applications in the Growl Applications in the System Preferences.
Please help as I need new mail notifications in hotmail!
Thanks guys :-)