Cannot send and receive Emails via Windows Live Mail since December 2014 (!)

Hi,

Something happened in December 2014 - suddenly I could not send and receive Emails via Windows Live Mail.

I am using Vista and the WLMail version is 2009 (Build 14.0.8089.0726).

This also happened with my other computer with Windows 8.1 and also when trying to create a new account both via HTTP and POP.

Please see the errors :

1)

Unable to send or receive messages for the Hotmail  account. Sorry, we were unable to sign you in to Windows Live ID at this time. Please try again later.

Server Error: 0x80048820
Server: 'http://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80048820

Unable to send or receive messages for the Hotmail  (1) account. Sorry, we were unable to sign you in to Windows Live ID at this time. Please try again later.

Server Error: 0x80048820
Server: 'http://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80048820

2)

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

Server Error: 0x80072EFD
Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80072EFD

3)

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

Server Error: 0x80860010
Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x80860010

Thank you very much for you help.

(Moved from Windows 8.1)