unable to sync live mail to hotmail 0x800488EB

I have WLM 2011 on Win7. There are 2 gmail accounts and 4 Hotmail accounts. As of ~4days ago, two Hotmail accounts now no longer work, but the other two do continue to work.

I have changed the time on the computer (it wandered ~15mins off).

I have applied any important updates from windows update.

I have deleted one of the accounts and tried to re add it into WLM. It fails to sync (0x800488EB).

I have not changed the other bad account, it still fails to sync on send and receive (0x800488EB).

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

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

 

The other two Hotmail accounts still work and sync as expected.

The gmail accounts work and sync as expected.

 

I have logged into one of the failing Hotmail accounts via the web, all appears well.

I'm confused as to why one account works and one does not when syncing in Windows Live Mail 2011.

Plse advise.