Windows Live Mail won’t authorize – Windows 8.1 System

Up until about 6 hours ago WLM worked perfectly.

Now when WLM is started it wont authorize. All Inbox, Sent, etc. e-mail details appear but the bottom right message says authorizing and eventually a Logon Dialog Box appears requesting Username and Password. When these are entered they are not accepted and the Dialog Box reappears.

I can receive e-mails when I initiate the Send/Receive button but can't send e-mails. They stay in the Outbox. A WLM Dialog Box appears advising that "Some errors occurred while processing the requested tasks. Please review the list of errors below for more details", however, no details are shown.

I can send and receive mail when I go into the Orange Web mail system.

I have spent a long time talking to Orange my e-mail provider and they maintain that this is a WLM problem.

I have "repaired" Windows Essentials but this had no effect.

Can someone please help me to resolve this issue.