In yesterday’s post I described how you could extract Office 2003 updates. When they are extracted however, they still need to be slipstreamed into the package. I also created this script to automate the slipstreaming.
Basically for each extracted patch (.msp) file, it runs msiexec with the correct parameters. So if you have other msi packages that need multiple patch (.msp) files applied to it, you could use this script as a foundation as well.