Unable to send or receive messages for the Hotmail (zxath) account.

Server Error: 4102

Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'

Windows Live Mail Error ID: 0x8DE00001

Windows Live mail will send mail but will not receive mail from my Hotmail account. Can anyone advise me what's happening? will it fix itself? is it a problem with hotmail etc????....It's absolutely urgent I get this sorted asap.