Hello,
Some time back I had put up a challenge to the list to install Open Office 3 in Ubuntu 8.04 and looks like no one has been able to do that. Well in Windows XP you simply uninstall the older Open Office version and install the latest version. You could even install OOo3 over the older 2.x version. So on _this_ point I declare Windows XP the winner. ;-)
On Saturday I have to remove Ubuntu 8.04 from 5 machines and install Ubuntu 9.04 simply because upgrading Open Office is not possible in Linux.