Single sign-on (SSO) is a Microsoft Office SharePoint Server feature that provides storage and mapping of credentials such as account names and passwords. Using SSO, portal site–based applications can retrieve information from third-party applications and back-end systems such as Enterprise Resource Planning (ERP) and Customer Relations Management (CRM) systems.

The use of single sign-on functionality enables users to authenticate only once when they access portal site–based applications that need to obtain information from other business applications and systems.

Replacing the default SSO Provider, SpsSsoProvider, in Office SharePoint Server 2007 involves implementing the Microsoft.SharePoint.Portal.SingleSignOn.ISsoProvider, installing it into the global assembly cache, and registering the new SSO provider with Office SharePoint Server 2007.

At any time, you can only register a single SSO Provider for Office SharePoint Server 2007. Registering a new SSO Provider replaces SpsSsoProvider in Office SharePoint Server 2007.

Websoft Solutions could happily provide the consultation as the implementation requires careful analysis and review of pluggable SSO based on the scenario required by your organization.