For 2X VirtualDesktopServer 9 to work with VMware ESX/ESXi, full vSphere Web Services SDK support is required. This is a Web service that allows interaction with vSphere.
vSphere Web Services SDK is fully supported using one of the following licenses:
- vSphere Essentials
- vSphere Essential Plus
- vSphere Standard
- vSphere Advanced
- vSphere Enterprise
- vSphere Enterprise Plus
However, 2X VirtualDesktopServer will not work with the free vSphere Hypervisor (ESXi with a free vSphere license key). Note that 2X VirtualDesktopServer 9 is compatible with a wide variety of hypervisors.
This information was obtained here: VMware ESX and ESXi 4.1 Comparison. Please find additional VMware licensing info below:
VMware vSphere for Small Business
VMware vSphere for Non-SMB Licenses
Please refer any related inquiries to our 2X Support team, at email@example.com.