Want to improve this question? Update the question so it's on-topic for Stack Overflow.
Closed 8 years ago.
I've heard different things. Seems like Microsoft experimented with a beta service, but I don't know if it's still available, or ever made it into production.
If Windows Live ID is an OpenID Provider, where is the endpoint?
No. Windows Live ID is not an OpenID Provider. They use a proprietary protocol. Ever since the close of their "beta" period, they've never announced plans to continue with it.
Check out this, I believe they use OAuth (not OpenID).
Looks like it really hasn't made it into production.
http://winliveid.spaces.live.com/ (blog post permalink)