EXPLANATION This message should occur only on a down-level computer. Any action to correct the problem should be performed ...

EXPLANATION    This message should occur only on a down-level computer. Any action to correct the problem should be performed on that computer.  Your user name is already established as a message  alias. Either your user name and computer name are the same, or your user name is in use as a message alias on another computer on the network.   If your user name is being used as a message alias on another computer, you cannot receive messages at the loca  l workstation using this name.    ACTION    If your user name is being used as a message alias on another computer, delete the alias on that computer. Then log on again at this computer.