For step-by-step instructions about how to install the Windows SBS 2003 R2 Premium Technologies, insert Premium Technologies Disc 1. Note You can install the R2 Technologies before you install the Premium Technologies, but it is recommended that you install the R2 Technologies after you have installed the Premium Technologies. For more information about how to obtain Service Pack 1 for Windows Small Business Server 2003, see the (After completing Windows Small Business Server 2003 with SP1 Setup, and after installing the Windows SBS 2003 R2 Premium Technologies (if you are installing the Premium Edition of Windows SBS 2003 R2), you can use the R2 Technologies disc to install the Windows SBS 2003 R2 Technologies. If you have not installed Service Pack 1 for Windows SBS 2003, you must do so before you can install the R2 Technologies. Windows SBS 2003 R2 is an incremental software update to Windows SBS 2003 with Service Pack 1 (SP1). To download the latest updated version, visit the (The update might contain critical information that was not available when the Microsoft® Windows® Small Business Server 2003 R2 server software (Windows SBS 2003 R2) was released.
The server came with a Win 2k3 SBS Standard OEM license & key.
To add insult to injury, Dell doesn't stock any replacement media for any OS older than Windows Server 2003 R2. I have inherited a Dell PowerEdge 830 that has Windows Server 2003 SBS loaded on it.