• heres what wiki has to say about this

    Windows Internal Database (codenamed WYukon, sometimes referred to as SQL Server Embedded Edition) is a variant of SQL Server Express 2005 that is included with Windows Server 2008 and Windows Server 2008 R2, and is included with other free Microsoft products released after 2007 that require an SQL Server database backend.

    Thanks for asking this , i never knew there was one more version of sql out there.

    Jayanth Kurup[/url]