Cant access my Hotmail account in windows live mail

some time i can't access my Hotmail account in windows live mail,

error is

Server Error: 0x80072EE7
Server: 'http://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80072EE7

Please help

<Windows XP>