Lets begin at the beginning, Windows OS + Software Assurance = Windows Vista Enterprise and Windows Vista Enterprise = Desktop Virtualisation and extended license rights
To clear up any confusion around the rules on Virtualisation and Windows Vista Enterprise
Windows Vista ENTERPRISE, ULTIMATE or a 3rd party product must be installed on the physical host to run the Virtualisation software, these versions are the only option available if you want to avail of the extended Virtualisation rights, namely 4 additional virtual OSEs!!
You may not use Windows Vista Business or XP or any other version of Windows on the physical host
You may run an instance of any edition (Business, Enterprise or Ultimate) or a prior version of the software in place of the licensed version on the Virtual Desktop OSEs
Why is Windows Vista Enterprise right for me?
If you want to have multiple Windows OS on a single PC, if you want the technology advances of Windows Vista, but still need legacy editions of Windows OS or Desktop Applications
So the above covers off the extended Vista Enterprise rights, each license will give you up to 4 virtual instances of the Windows OSE per device, but what if you decide you would actually like to store these additional virtual instances of Windows OS on a server, or VHD or SAN, well, that’s covered too
Windows OS + SA also = Remote Boot
This new right permits, as an alternative to installing the software on your desktop PC, install copies of Windows Vista on a storage device, such as a network server.
You can then run those copies locally on the desktop PCs by remote booting an operating system image over an internal network from the storage device.
This right applies to Vista Enterprise, Vista Ultimate (available through Software Assurance), or any eligible prior version of Windows Vista Business, if you choose to run either of those editions in lieu of Vista Business.
Why is remote boot right for me?
If you want to have PCs with the option of no local hard drives, were your devices connect and pull a central image down to the PC only when connected to the server, this is the correct solution for you!
And what if you want to run Windows OS on a server and access via PCs or Thin Clients well that’s VECD