After you've installed the Office 2003 MUI Pack, you can add additional language support and switch user interfaces among the languages you've installed.
To work with the language settings, make sure that all Office applications are closed, and then open the Microsoft Office 2003 Language Settings dialog box and select the User Interface and Help tab. This tab will appear only after you have installed at least one MUI Pack.
From this tab you can select separate languages for Office 2003 and Help.