VMware Horizon View offers three different license levels: Bundle, Add-on, and Add-on to Bundle Upgrade. The license levels are differentiated by whether or not they include licenses for vCenter Server and the vSphere hosts. The licenses are sold in 10 and 100 packs.
The Bundle license includes all the features of VMware Horizon View, including the licenses needed for the vSphere desktop hosts and vCenter Server. The version of vSphere included with this license is known as vSphere Desktop.
The Add-on license includes all the features of VMware Horizon View, but you must provide your own licenses for the vSphere desktop hosts and vCenter.
The Add-on to Bundle Upgrade license is for customers who already have Add-on licenses, but wish to upgrade them to the Bundle license level.
The advantage of using vSphere Desktop is that it is licensed on a per-desktop basis, while a traditional vSphere license is licensed on a per-socket basis. This provides View customers with maximum flexibility when considering what servers they will use when deploying their View infrastructure, as it removes the per-socket licensing costs as a deciding factor in server selection.
Visit the VMware Horizon View website (http://www.vmware.com/products/view/overview.html) for the most recent information concerning licensing options and their costs.