Currently my company has 4 esx hosts running in 2 seperate HA Clusters. The clusters are currently hooked to Vsphere 4.0 running a 32 bit OS. I have build another box and installed Vsphere 4.1. I need to upgrade my hosts to 4.1 and move them to the new Vshpere 4.1 box. Is their a way to accomplish all of this without shutting down any of my Vmware guests. What would be the correct order to do this migration ? Also Im a running Vmware Enterprise Plus.