It's still the same icon, it hasn't changed.
If you changed it to a different icon or different keyboard shortcut, you need to check in Preferences.
See the
FAQ for more info:
quote:
#25. I accidentally locked msn!
You probably pressed the keys that lock messenger by default (control+space). To unlock it you can click the disconnected disk icon.
Or: Start Taskmanager (Ctrl+Alt+Delete) or Ctrl+Shift+Escape and look for "msnmsgr.exe". End the task.