Microsoft Volume Licensing for Servers
We are planning on purchasing a few new servers in the next few months and I've started to look at Microsoft licensing for Windows Server 2008.
What is considered a "qualified upgrade product" to be eligible to use a volume license for Windows Server 2008? Meaning, what operating system would I have to already be licensed for, to use a volume license for the server.
I've looked over the Microsoft documentation and could not find any helpful information on this.