Windows Live Email Error 0x800488EB

Hi, I just started having this problem on both of my laptops 2 days ago:

Unable to send or receive messages for the Hotmail (xxxxxxx) account.

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

I tried repairing Windows Live Essentials twice, and I have removed and added my email account several times with no success.

Can you please help? 

This is happening on 2 different laptops, one running Windows 7 and the other is running Windows Ultimate Vista. 

Thank you kindly! 

Melanie Heywood