Before we start with the installation of SBS 2003 R2 we need to verify that your existing server has the correct service packs installed. Please, check if your server has the following service packs installed: SBS 2003 SP1 (if you have not yet installed this service pack please see here for details http://www.server-essentials.com/support/articleid/72/how-to-install-service-pack-1-for-sbs-2003 Exchange SP2 (if you have not yet installed this service pack please see here for details http://www.server-essentials.com/support/articleid/73/how-to-install-sp-2-for-exchange-server-2003 Windows Sharepoint Services 2.0 SP2 You will need at least 8 GB free space for WSUS updates and 1 GB on your system drive. For further information about SBS 2003 R2 and the latest release notes please check: http://go.microsoft.com/fwlink/?LinkId=66573 . If one of the above is not installed the installation of the SBS 2003 R2 Technology Upgrade will fail. Insert SBS R2 Technologies disc CD1 (not the Premium CD's, those are needed later when we upgrade your SQL 2000 Sharepoint instance to SQL 2005).