Hi again,
Here a nice tip from Mark Kean for automating office installations as part of moving to the cloud.
Uninstall old ones: http://marckean.wordpress.com/2013/06/18/fully-automate-removal-of-any-version-office-in-preparation-for-office-365/
Install new one: http://marckean.wordpress.com/2013/07/01/fully-automate-the-installation-of-office-365/