Is this even possible? I want to build a small community site but do not want to use Live ID.
SharePoint Server supports various authentication methods and authentication providers for the following authentication types: Windows authentication. Forms-based authentication. SAML token-based authentication.
Across all of SharePoint Online, the root Federation Authentication (rtFA) cookie is used. The rtFA cookie is used to authenticate a user silently without a prompt when he/she visits a new top-level site or another company's page. When a user signs out of SharePoint Online, the rtFA cookie is deleted.
Sharepoint has an extensible authentication provider model, so you could use that to extend it to support openid.
See the OpenID membership provider project on CodePlex. This provides OpenID support for SharePoint.
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