NeoWin has posted the roadmap for Windows Server versions. Notice in the screenshot the “Virtual Server”, which probably will include an integrated runtime engine to run multiple Windows on the same machine (for similar purposes to what IBM does with Linux). Update: Neowin removed the story but the roadmap image is still up (for now). To view the image you need to manually copy/paste its URL to your browser’s address bar. Direct linking won’t work. Update 2: The story is back up.