If you want to customize your Office 2007 setup, here’s how:
setup.exe /admin
Then go through all steps in the customization wizard.
Be sure to have “completion notice” turned on and “suppress modals” turned off (this is to get to see errors, if any exist). Once you’re done with testing, go through the customization again to modify the MSP to disable completion notice and enable suppress modals. For completely silent install, you MUST set the DisplayLevel to “none”.
Save the resulting patch file in the same folder as o2k7 setup files.
Now just execute this command for silent install:
setup.exe /adminfile CUSTOM.MSP
OR
If you have Office 2007 Enterprise VLK, you could even drop the CUSTOM.MSP file in the “Updates” folder and setup will pick it up automatically (without any switches being used). For this, ensure you have WindowsInstaller 3.1 already installed. You can add in further MSP files (e.g. extracted from SP2 update EXE) as well, to have updates applied during install.