Help!  I'm getting the same error message I got a couple weeks ago:

Unable to send or receive messages for the Msn account.

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

My understanding is that there was nothing we users could do to fix this certificate problem.  Could sure use a Microsoft engineer right now!