Looking at potential ways to deploy Office 2013 via GPO.

First and most obvious way is to run a startup script which calls the Office 2013 setup.exe. Problem here is what happens after it is installed, will that startup script keep re-installing the product every time the machine boots?

Another potential way is to install each Office component separately using the multitude of .msi files which are present, would that work and provide the same thing as a full install of Office? There is actually twenty three separate .msi files. What about officemui.msi is that a wrapper which contains calls to all of the other office components.