<p>Microsoft has been using their Passport, now <a href="https://accountservices.passport.net/ppnetworkhome.srf?vv=500&amp;lc=2070">Windows Live ID</a> since Hotmail become popular, and a lot (and when I say a lot, I mean A <span class="caps">LOT</span>!) of Internet users do use it.</p>

<p>Recently, Microsoft has released the <a href="http://dev.live.com/liveid/">Windows Live ID Client/Web Authentication <span class="caps">SDK</span></a> that allows users to base their authentication systems on Windows Live ID. This is a great solution for a single sign-on, but all the authentication is relied to Microsoft. Most users won&#8217;t find this a problem, but other will.</p>

<p>Well, there is a more open solution to this problem: <a href="http://openid.net">OpenID</a>. I&#8217;ve <a href="http://alcidesfonseca.com/blog/83">wrote about this before</a> but now, I have an idea for a new project and I wanted to hear some feedback.</p>

<p>I know that <a href="http://www.identityblog.com/?p=668">Microsoft has been working together with OpenID</a> to improve the system and make both systems compatible, but I can imagine a quick way of making live ID work as an OpenID: I&#8217;m thinking of making my own OpenID provider that uses Windows Live ID as a authentication. Yeah, it will re-delegate the authentication, and probably will take more time, but it will use the authentication you already have (thinking about liveID users).</p>

<p>I wonder if you have any suggestions, or are interested in helping out :)</p>