Microsoft Knowledge Base Article 828955 contains the following summary:

This step-by-step article describes how to install Microsoft Office 2003 on either of the following computers:

Microsoft Windows Server 2003-based computer with Terminal Services enabled.
Microsoft Windows 2000 Server-based computer with Terminal Services enabled.
Before you install Office 2003 to the Windows 2000 or Windows Server 2003 Terminal Services computer, the computer must be configured as follows:

Terminal Services is installed and enabled.
Terminal Services is configured for application server mode for multiple terminal server clients to run Office 2003.