A strange thing happened to my messenger, it was opened it today and my surprise was that all the contacts I have are listed as ( not allowed ).

Searching the net I find the solution.

Close MSN and open a terminal window and move to this directory:

There you find a file named:

Microsoft Messenger User Cache.plist

What we have to do is rename the extension to any other (eg. Bak) to restart MSN after re-create your configuration settings.

We do this process by:

Reboot MSN to see that everything worked properly.