- unpack the installation files by starting the standard installer and hitting cancel once the files are unpacked
- cd to the directory where the files were unpacked
msiexec /i openoffice2.2.msi /qb INSTALLLOCATION=pathWhereYouWantToInstall
Note that this will not suffice if your intent is to run OpenOffice as a document processing server. You will need to override the Setup.xcu file as explained here.