This is one of those things that should have "in theory" after it. In any case, I could not install on an SBS 2008 server. I think this is might be deliberate because they want to sell SBS 2008 Premium which includes a separate server license for Windows Server 2008 with latest greatest SQL. Or it may just be some other problem. In any case, I'm not sure I would want to load down the domain server with the SQL server.
How many connections can we make to a SQL Expres server? When I add one more computer to my current system, the Access server comes back saying the computer has too many connections.
Anyone else there with an SBS installation? Are you using the features? Fax system? E-mail and Exchange server?