On a Dell T410 Server, I installed VMware's ESXI 5.5 Host along with a Windows 2012 Essentials VM and Win XP VM just for testing. Those run fine.
One of my clients needs to migrate from Windows 2003 SBS to 2012 Essentials, so I took a Windows backup of his server. My plan was to Install a 2003 SBS VM, run a Windows restore from my clients server backup (that is on an External USB drive) and run a test migration from 2003 to 2012.
I installed the SBS 2003 VM fine from DVD's. I tried adding the USB controller and USB drive to the VM and then got a message a new device was found - Base System Unit, but can't get a driver for it.
Attached is a screen print.