OK, so reading through the install docs if you are building a NEW Unity box, the software that ships is listed below. When I run Exchange 2000 I receive an error saying not supported on this OS (which is Win2k3). How do you build a VM Only box?
Windows 2003 Platform Configuration Disks for IBM or HP Servers
Data Store 2000 (SQL 2000)
Enterprise Message Store 2000 (Exchange 2000)
Unity Application version 4.2(1)