Please note that support for SBS 2003 SP 0, also known as SBS 2003 RTM, will be retired on July 10, 2007. For more information see : http://support.microsoft.com/gp/lifesupsps.
It has now been over 3 years since SBS 2003 first came out so if your product is not current then it is strongly recommended that you upgrade or install SBS SP1.
CIAOPS 