Cannot send or receive email from any WLM accounts – error 0x800CCC90

Hi,

Really urgent question!

Every time I try to send messages from my accounts (I have three), this error message pops up:

Unable to send or receive messages for the Info Robertboysshipping account. The email server returned an error.

Server Error: 0x800CCC90
Server Response: -ERR 
Server: 'mail.robertboysshipping.co.uk'
Windows Live Mail Error ID: 0x800CCC90
Protocol: POP3
Port: 110
Secure(SSL): No

It is the same for all the accounts (...@robertboysshipping.co.uk). It was working fine this morning and then suddenly, for no reason I can see, this keeps happening. I haven't changed any of the server settings in the accounts. The only thing I can think of is that we attempted to add two more accounts to the ...@robertboysshipping, neither of which are working properly/work intermittently - I've sent some test emails from these new accounts to the ones we normally use. Could it have affected the existing accounts?

I've tried moving all the message in my inbox to another file then transferring them back but it hasn't helped at all.

It's really urgent as this is a work email and none of us are receiving any correspondence.

Any help would be really appreciated!

Thanks!