OpenOffice.org 2.x

First, download OOo_2.0_Win32Intel_install.exe from OpenOffice.org Website.
Execute the downloaded installer - it creates a directory named OpenOfficeorg 2.0 Installation Files, which includes several files. The ones you need are:

openofficeorg1.cab
openofficeorg2.cab
openofficeorg20.msi
openofficeorg3.cab
openofficeorg4.cab

excerpt from package.xml, adjust your paths accordingly:

<package id="ooo-2.x" 
 name="OpenOffice.org 2.x" 
 revision="1" 
 reboot="false" 
 priority="0">
 <check type="uninstall" condition="exists" path="OpenOffice.org 2.0" />
 <install cmd='"msiexec" /i \\Server\wpkg\pkg\OOo_2.0\install_en\openofficeorg20.msi /qn'>
   <exit code="0" />
 </install>
 <remove cmd='"msiexec" /x{CE91484F-B0CF-4494-8BA6-7242EE913626} /qn' />
 <upgrade cmd='"msiexec" /i \\Server\wpkg\pkg\OOo_2.0\install_en\openofficeorg20.msi /qn' />
</package>

The uninstall ID can be checked from the file setup.ini in the directory OpenOfficeorg 2.0 Installation Files

The best way to install a localized build (in my opinion) is to also install localized language pack. Then the user can choose if he wants to have the English interface or the localized one. An example for Estonian language pack:

<package id="ooo-2.x-et" 
 name="OpenOffice.org 2.0 Language Pack (Eesti)" 
 revision="1" 
 reboot="false" 
 priority="0">
 <check type="uninstall" condition="exists" path="OpenOffice.org 2.0 Language Pack (Eesti)" />
 <install cmd='"msiexec" /i \\Server\wpkg\pkg\OOo_2.0\langpack_et\openofficeorg20.msi /qn'>
  <exit code="0" />
 </install>
 <remove cmd='"msiexec" /x{9F5CAB24-B19E-42FD-AF8D-774C5C36A7FB} /qn' />
 <upgrade cmd="" />
</package>