On most servers Excel is not installed. Hence, during the install of Jedox it is not possible to install the Excel plug-in. We just install OLAP, Web, Tomcat etc.
Subsequently it is not possible to add the Excel Plugin to the install on the server (at least so it seems) once it was decided that Excel is also installed on the server after Jedox was installed originally. One has to uninstall the server components and then completely re-install everything, just to add the Excel plugin. It would be nice if the installer was capable of installing the Excel Add-In, AFTER other components have been installed.