Riverbed is announcing new versions of their Steelhead product line including Steelhead Mobile 4.0, Steelhead EX and Granite appliances, and Steelhead 5055/7055 appliances. The updates extend WAN optimization to mobile users at large scale, integrate Steelhead EX with VMware virtualization, and improve performance and scalability of the Steelhead appliances. Riverbed is also releasing an updated RiOS 8.0 operating system with enhanced security, quality of service, and management capabilities.