There was a short burst on e-mail the other day about this, but I thought I would share.  The situation was that someone was adding SBS to an existing domain, not a problem, but the existing domain had some trusts set up.  Since SBS does not support trusts things did not go well.  So, to follow up we need to remind everyone that when doing this you get a short period of time to make everything within the SBS constraints or things stop working.  Details on how to do all of this are documented in the Knowledge Base (KB)article mentioned below.

Here are the bones of the internal notes:

You can add one SBS to an existing domain, but the SBS requirements have to be met within a certain grace period.  (14 days, according to KB 884453.)  By the end of that grace period:

• The new SBS 2003 computer must be a domain controller that is installed on the root of the domain.
• The new SBS 2003 computer must hold all the Flexible Single Master Operation (FSMO) roles.
• The new SBS 2003 computer must be a global catalog server and must be the licensing server.
• There must not be any existing domain trusts or child domains.
• Only one SBS server can exist on the domain. If SBS 2003 is installed, no other SBS 2003 or 2000 server can be installed on the same domain.

thanks

David