Microsoft has released Virtual PC 2004 as a free product now. Earlier Microsoft also released Microsoft Virtual Server 2005 R2 as a free product. SP1 beta 1 for Virtual Server 2005 R2 is downloaded from Microsoft.
Whether Microsoft virtualization technology is an important component of your existing infrastructure or you’re just a Virtual PC enthusiast, you can now download Virtual PC 2004 Service Pack 1 absolutely free. Microsoft is also offering the free download of Virtual PC 2007, with support for Windows Vista in 2007.