Just a quick question: how many WIndows licenses do I need when protecting a Windows server with FT? I have seen different opinions on this floating around the net...
This is really a question for Microsoft to answer but I would say one because you are only accessing a single instance at a time -
We went through this a while back.
Whether people like to admit it based on what is convenient or not, even HA is not covered by Windows VLK licensing. A license is assigned to one physical machine. The abillity to "fail over", or vmotion around for maintenance is provided as a feature of Software Assurance.
The loophole of course is to buy Datacenter edition for each host. Then you can pretty much do what you want.