This just happened--It was working fine.  I use Windows Live 2011 and IE11.  I have changed nothing except routine updates from Microsoft.  The error message is: 

Unable to send or receive messages for the Msn (pinonbistro) (1) account.

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

I am able to send and receive emails in this account on my Iphone.  Coincidentally IE11 seems quite unstable--stops responding on occasion.  I cleared the cache and IE seems to work fine now.  I just used it to log into outlook.com and was able to send and receive emails.  Why can't I use Windows Live 2011 to do it?