I have a small project on Google App Engine. And there I have a login system via OpenID, very basic, in accordance with the instructions in the documentation that exists in the same GAE.
In the documentation there is a list with the link of OpenID's like Yahoo and Google. I wonder what is the link to my app to authenticate using Windows Live OpenID.
On
You can register an app to authenticate against Windows Live or Work or School accounts at https://apps.dev.microsoft.com
Windows Live did once support OpenID in 2008/2009, but that was canceled - see https://stackoverflow.com/a/4057119/282601