Can I request downgrade rights from Windows SBS 2003 R2?
Yes. You can downgrade from Windows SBS 2003 R2 Premium Edition to Windows SBS 2003 Premium Edition with Service Pack 1. You can also downgrade from Windows SBS 2003 R2 Standard Edition to Windows SBS 2003 to Windows SBS 2003 Standard Edition with Service Pack 1. If you obtained your server with SBS preinstalled from a partner or OEM, in order to exercise your downgrade rights you must already have your Windows SBS 2003 media available. If you purchased Open Licensing, Volume Licensing, Software Assurance, or purchased the full retail product of Windows SBS 2003 R2, contact Microsoft fulfillment services in your region.