The following knowledge base article discusses how to install Esri Maps for Office: http://doc.arcgis.com/en/maps-for-office/help/install-esri-maps.htm
The Command-line install of Esri Maps for Office (EM4O) requires that the prerequisites be installed beforehand. This is because the silent install does not check for prerequisites nor installs them because the User Interface is not run. The main reason for this is that the .NET Framework installation requires a reboot of the system upon completion.
It is therefore neccessary to install the prerequisites before EM4O, otherwise the silent install of EM4O will not work.
Below are the links to the prerequisite install files that can be run silently before the silent install of EM4O: