Unable to send or receive messages for the Msn (XXXX) account.

Server Error: 0x800488EB
Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x800488EB

1) Tried another @hotmail account and able to sync with windows live mail, but not with my @msn.com account. 

2) please advise