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Member Servers in an SBS 2003 Domain

Additional Domain Controller

"You may, however, add other member servers to your domain to spread the load for some functions. You may also add additional domain controllers, but there are certain limitations. The Flexible Single Master Operations (FSMO) roles, the Global Catalog, and the Operations Master role must remain on the SBS machine. While the software will not stop you from moving these roles off to another domain controller, once you do, the server will shut itself down every hour or so until you either put the transferred roles back or you remove the SBS machine from the domain altogether. This product is mainly intended for use in a single-location environment. Once you expand to any sort of multi-location environment, you will run up against these limitations." -- http://www.microsoft.com/technet/technetmag/issues/2005/11/OnSite/