By John Savill, FAQ Editor at windowsitpro.com
Microsoft has announced that Virtual Server 2005 R2 Enterprise Edition is now available as a free download from Microsoft and requires only basic registration. Combined with the new usage rights in Windows Server 2003 R2 Enterprise Edition, which allow four concurrent guest OS instances to run under the one Windows 2003 R2 Enterprise Edition license, the use of virtualization will grow rapidly. When Longhorn server ships, the Datacenter Edition will allow unlimited Windows guest OSs at no additional licensing costs (however, Longhorn Datacenter isn’t cheap).
VMware also provide a free server virtualization product.