The Windows Virtual Dedicated Servers (VDS) and Virtual Desktop Instance (VDI) are singletons intended for interactive work, such as virtual machines on demand. The main difference between the two is that the VDS has a server-type OS, such as Windows 2012, and the VDI has a client-type OS, such as Windows 8. In addition, most VDIs have the remote desktop enabled.
A typical usage of the VDS is by by hosting providers to offer dedicated servers using AppLogic without the need for any other third party software or licenses.
For the VDI usage, you could provision the VDI instance for each user as well as customize the VDI template before provisioning. In addition, you can create multiple different templates, such as with Microsoft Office and without. Once a VDI is provisioned, it can be started, stopped, or migrated to another location. For example, if your employee is traveling for a month to a new location, you can migrate the VDI to that location to provide faster access, then migrate it back when the employee returns to the home office.
For small setups, you can even put several VDIs in a single application to group VDIs together. For example, one per department or per customer account.
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