rpm --upgrade not upgrading?

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http://unix.stackexchange.com – Can someone please help me understand the rpm command. From the rpm man pages: rpm {-U|--upgrade} [install-options] PACKAGE_FILE ... This upgrades or installs the package currently installed to a newer version. This is the same as install, except all other version(s) of the package are removed after the new package is installed. My understanding is that if I indicate a PACKAGE_FILE that is an upgrade of something I already have installed, it will replace the files... upgrading the package. Specifically I am trying to upgrade VirtualBox on a Fedora 14 OS. I am running the following comman (HowTos)