Just a quick note to help other ESXi 5 admins… The package Teradici provides for this gives an ollllld vmx and vmdk. The simplest way to get it to work on ESXi 5 is to convert the disk like so:
vmkfstools -i teradici.vmdk teradici-new.vmdk -d thin
Do this via ssh on the ESXi host… Next, edit the settings of the vmx in vSphere, remove the unsupported devices, and add a new Hard Drive attaching the converted disk. Lastly, upgrade the Hardware to version 8 and it should work flawlessly!