hey, i have a problem with my messenger for mac. upon turning on my macbook pro and manually opening messenger, after about a minute of it trying to log in a message pops up saying: 'sign in to microsoft messenger failed because the service is not available or you may not be connected to the internet'. my internet connection is fine, and my log in details are correct. and also upon discovering this problem i realised my ichat wasn't working either, but i fixed that but changing the port number to 443 (i found this help on a forum). i'm completely unsure of what to do, i hope someone can help me. thanks.