I can't log onto any messaging application in OSX on my school network. BUT when i boot up xp via Vmware's Fusion, msn messenger, yahoo, and aim will work... itunes in osx downloads podcasts fine so i know other apps can access the internet..

Any ideas?

BTW to log onto my school network its an unencrypted wifi, you connect and if you try to go to any website outside of the school's then you just have to enter your username and password for that session...