This IDC study provides a top-down sizing of the virtual machine software market in 2006 and a 2007–2011 forecast for this market as well as insights into the changing usage models as the technology matures and customers take advantage of new tools and capabilities. "The long-term outlook for server virtualization continues to be very positive as the technology is becoming a foundation for the dynamic enterprise," said John Humphreys, program VP, Enterprise Virtualization. "The new use cases have significantly increased the opportunity for the vendors participating in the virtualization market."