SBS 2008 est RTM depuis peu...

http://www.microsoft.com/windowsserver/essential/sbs/default.mspx

both SBS Standard and Premium have RTM’d, and will be widely available by our November 12 launch. Stay tuned for more information about the launch.
http://blogs.technet.com/sbs/archive/2008/08/21/sbs-2008-released-to-manufacturing.aspx

Déjà des informations sur les erreurs d'installations et leur solution...

http://blogs.technet.com/sbs/archive/2008/08/26/known-post-installation-event-errors-in-sbs-2008-and-how-to-resolve-them.aspx