Hi I have VMM08 with Citrix XenDesktop. Yes, We have in our company this infraestructure. There is a few around the world ;-). I migrated VMM08 to VMM08 R2 , so CitrixXendestop was down. I upgrade the VMM08 R2 agent. I reboot the CitrixXenDesktop Server I reconfigured the options in the farm (view picture). And everything starts to run again.