Installing SBS 2008 Client Access License CAL on SBS 2003

You cannot purchase SBS 2003 Client Access Licenses any longer – only the SBS 2008 CAL which is downgradeable. However when you get the 2008 CAL, the OEM or FPP versions do not have a product key which is required for installing the extra licenses on an SBS 2003 server.

Based on the country you are in, you can either call or e-mail to get the product keys for SBS 2003 CALs as you downgrade your SBS 2008 CALs.

Please see here for contact information.

http://www.microsoft.com/sbs/en/us/contact.aspx