Windows live mail not responding Optusnet email account

Hi.

Windows mail has been working fine up to today.

I got an error message when trying to send message which was 0x800CCC78.

I had not changed any settings / passwords  etc and hadn't had this occur before.

Since then, now Windows live mail isnt connecting to receive emails either.

I can send & receive directly through Optus Web Mail.

Any ideas?

Thanks

<Windows 7>