Upgrading your Virtual Infrastructure Management Components http://download3.vmware.com/vsphere/vsphere-migration-part1.html ESX Host Migration Methods http://download3.vmware.com/vsphere/vsphere-migration-part2.html Virtual Machine Upgrades http://download3.vmware.com/vsphere/vsphere-migration-part3.html Implementing vSphere Licensing http://download3.vmware.com/vsphere/vsphere-migration-part4.html