Seems like my problem is similar to others. My error code is as follows:

Unable to send or receive messages for the Msn account. Sorry, we were unable to sign you in to Windows Live ID at this time. Please try again later.

Server Error: 0x80048820
Server: 'http://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80048820