http://blogs.msdn.com/johnwe/archive/2008/05/11/slipstreamed-sp1-made-available.aspxRead all about it here: http://blogs.msdn.com/sharepoint/archive/2008/03/07/moss-2007-with-sp1-slipstream-officeserverwithsp1-exe-released.aspxen-USCommunityServer 2.1 SP1 (Build: 61025.2)