MSN email “5.7.8 MSN “Error: authentication failed: authentication failure” & “5.7.8 Error: authentication failed: authentication faiure”

I have a MacBook Pro running OS 10.8.4 and Mac Office Outlook 14.3.6.  Today for the first time I have been receiving the following error message when sending emails via msn: "The server does not support secure connections."  I consulted the forms and there it was recommended to disable "Use SSL to connect" for both out-going and in-coming messages.  I first disabled that for out-going messages only and then for both.  Each time the following error message is returned:  "5.7.8 Error: authentication failed: authentication failure".  It then asks whether I want to reenter my password.  I did so the first time to no avail; the same error message was returned.  Please assist.