I came across the need to deploy iTunes using MDT (2010 or 2012). Unfortunately, there is no way to run the usual setup file with switches.
The key is to expand the installer (using 7-zip) and then create hidden applications for each component (that also allows you to prevent Bonjour or Apple Software update from installing…).
Install the MSI files in this order:
Using this command: msiexec /i XXX.msi /qb REBOOT=ReallySuppress
(where xxx is the msi filename, of course)
It also works for the 64-bit version. Every time there is an update of iTunes, simply overwrite the files on your network share.