Currently have 2 VMware hosts running ESXI 4.1 with vcenter essentials. So i am licensed to add a 3rd host, which i currently just bought. But I also purchased vcenter essentials 5.1 and want to upgrade the other hosts. Can i load esxi 5 on the new host and upgrade vcenter server to 5 and add the vsphere 4 hosts then upgrade them with update manager? or will i have to move the VM's off each host and then upgrade because of the version upgrade? Oh and they are all local storage hosts.