[teilo]

There is no such thing as instance or site pricing for Windows Server. Where are you getting that from?

There is only core licensing, and you have to license all cores in a hypervisor, 16 minimum, and then you can only run two Windows Server instances unless you re-licensing all cores on the host a second time. The exception to that rule is Datacenter edition, which is only cost effective for large businesses running high-density servers. (7.5x the price for the same number of cores vs. Standard.)

http://download.microsoft.com/download/7/2/9/7290EA05-DC56-4...