Parallels Compressor Server:  In addition to a virtualization engine for the Intel Mac, Parallels offers the Compressor, which "improves the performance of any Windows-powered Parallels, VMware and Microsoft virtual server or virtual workstation by reducing virtual hard disk size by 50% or more. .. Compatible with virtual servers built with Parallels Server (expected late 2006), VMware Server, VMware GSX Server, Microsoft Virtual Server.[or] Parallels Workstation 2.1, Parallels Desktop for Mac, VMware Workstation, and Microsoft Virtual PC." Two versions for sale, $50 and $180, with 15-day free trials.
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