After about 7 years or so of using the same email account, 5 days ago it suddenly stopped working.  I get the following error message:

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

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

I have tried researching for a couple of hours.  I am unable to find a solution and am at my wits end...the whole thing is very bizarre.  Any help would be greatly appreciated.