To add SBS CAL for 2008 or 2003 use the key KJQBH-XJ6YQ-THYJY-PVDCP-87QT6

The SBS 2003 client access licenses are no longer available for purchase. You need to purchase a 2008 or 2011 license, but used to have to go through a painful long winded process with Microsoft to provide the 2003 license code to use. Now you can use the license key-