Can anyone help as to how a problem with Hotmail can be rectified. I have been using Hotmail for 20 years and never have I had a problem except for this one which started yesterday

Unable to send or receive messages for the Hotmail account.

Server Error: 5102

Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'

Windows Live Mail Error ID: 0x8DE00002

Please help, not that computer literate