Just to share with everyone :
To install, download the lastest distro from openoffice.org
Start the installer to unpack the install files.
Create a bundle eg. Open Office 4.1.3
Select the openofficexxx.msi

Now edit the MSI properties :
ISCHECKFORPRODUCTUPDATES ; set to 0
CREATEDESKTOPLINK ; set to 0

Now add the following MSI properties :
SETUP_USED ; set to 1 ; this is key to let the program install via MSI
ADDLOCAL ; set to 1 ; to install for all users
REMOVE ; set "gm_o_Quickstart,gm_o_Onlineupdate" ; this is to get rid of the Quickstarter and Online Updater.

I had to do a lot of research to find this out.
Hope it helps somebody.