A virtual appliance upgrade baseline contains a set of updates to the operating system and to the applications installed in the virtual appliance. The virtual appliance vendor considers these updates an upgrade.
Virtual appliance baselines that you create consist of a set of user-defined rules. If you add rules that conflict, the Update Manager displays an Upgrade Rule Conflict window so that you can resolve the conflicts.
Virtual appliance baselines let you upgrade virtual appliances either to the latest available version or to a specific version number.