Okay, I got a Mac OS X from my brother, we set up the internet on it and everything. I clicked on the messenger, but it won't work. It told me: Sign in to Microsoft Messenger failed because the service is not available or you may not be connected to the Internet. So I downloaded MSN Messenger for Mac, installed it, tried to sign in but again it said the same thing!!! Someone help me, how do I make it work?!