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Citrix сказал, что новая версия его XenServer(ориентировочно будет доступна с мая 2009), будет бесплатна со всеми(ну, почти) вкусностями -

* Powerful Centralized Management enables full multi-node management for an unlimited number of servers and virtual machines; includes easy physical-to-virtual and virtual-to-virtual conversion tools, centralized configuration management and a resilient distributed management architecture
* Live Motion and Multi-Server Resource Sharing incorporates powerful XenMotion™ technology that allows virtual machines to be moved from server to server without service interruption for zero downtime; also includes optimal initial virtual machine placement and intelligent maintenance mode
* Proven Hypervisor Engine powered by the 64-bit industry standard Xen open source hypervisor developed jointly by more than 50 leading technology vendors, enabling users take full advantage of the latest performance, security and scalability enhancements in next-generation servers, operating systems and microprocessors
* Fast Bare Metal Performance supports an unlimited number of servers and virtual machines with industry-leading consolidation ratios, near native performance on the most challenging application workloads, and virtually zero overhead in both Microsoft Windows® and Linux environments
* Easy Setup and Administration features familiar interface with easy wizard-driven configuration, intuitive Web 2.0 style search, and built-in auto-help that makes the learning curve for new administrators a snap
* Integrated Storage Management that supports any existing storage system; includes built-in storage management features such as host-based logical volume management, and dynamic multi-pathing capabilities

Осталось понять - в чем подвох?

Правда, еще Citrix сказал про продукт Citrix Essentials for XenServer and Hyper-V - который даст нам:

* Automated Lab Management streamlines the process of building, testing, sharing and delivering applications on-demand throughout the full application lifecycle, from development labs to production servers. Because this functionality supports all of the leading virtualization platforms, customers can even run development and testing environments on one virtualization platform, and seamlessly move those applications into production on another platform.
* Advanced Storage Integration featuring Citrix® StorageLink™ technology fully leverages all the native power of third-party array-based storage systems making it easy for customers to manage advanced storage features directly from their virtualization management environments.
* Dynamic Provisioning Services reduce costs and optimize datacenter infrastructure by letting customers manage common sets of master workload images centrally and stream them on-demand to both virtual machines or physical servers.
* Workflow Orchestration enables users to automate key management processes across their virtual infrastructure using common task libraries and a graphical workflow canvas.
* High Availability delivers a broad range of powerful high availability options from automatic restart as the result of host or virtual machine failure to intelligent placement of virtual machines across resource pools based on resource availability.

Наконец, если вам встретится название Project Encore - это 20 летний договор сотрудничества Citrix и Microsoft в области серверной виртуализации.