The Windows Live Identity Services team at Microsoft are saying that Windows Live ID is the new universal single sign-on authentication service replacing Microsoft Passport (see screenshot).

According to Trevin of Windows Live Identity Services group, Windows Live ID will be the authentication system for Windows Live, Office Live, Xbox Live, MSN and other Microsoft online services.

Trevin further mentions in his blog that Windows Live ID will provide support for Infocard.

You will be able to link an Infocard to your Windows Live ID [Passport] and use it to access Microsoft, MSN and Windows Live services.



More Windows Live ID Screenshots: 1, 2, 3

Source: LiveSide - Windows Live ID