After migrating our VMware vCenter server from the 2.5 to the version 4.0 (HTTP://www.bujarra.com/?p=2700) we have to update the other components that we have installed, in this case we will update the VMware Update Manager environment 1.0 that we had in VMware Virtual Center 2.5 to the new environment for use with VMware vCenter 4.0 (vSphere), called VMware vCenter Update Manager 4.0. This will be a process to be performed before proceeding with the migration of the environment 2.5 a 4.0, since after updating the Update Manager, we will update ESX hosts from version 3.x to the 4.0, and then the virtual machines (both the hardware version of the 4 to the 7 and VMware Tools to the latest version). All this in future documents.