I'm working from a powerbook operating OSX and I've not been able to log into MSN Messenger for Mac since I installed it (several times, mind!). This has been about two months.
MSN have been spectacularly unhelpful over this two month period, taking at least a week or two to respond to each query/reply to their suggestions. None of them has worked.
I've tried uninstalling, reinstalling, clearing, everything! The error I get is that my user name or password is incorrect but I know absolutely this is wrong because a) I can sign in on other computers and b) I can still sign in to Hotmail on my Mac.