parallels compressor server is a complete professional-grade, easy-to-use disk management tool that helps save storage costs, maximize hard disk resources and improves the performance of any windows-powered virtual server or virtual workstation by reducing virtual hard disk size by 50% or more. parallels compressor server is compatible with any virtual server created using parallels server, vmware server, vmware gsx server, or microsoft virtual server, or any virtual workstation created with parallels workstation, parallels desktop for mac, vmware workstation, or microsoft virtual pc.