Citrix XenServer is a commercial implementation of the open source Xen virtualization solution. Citrix has extended the base Xen engine with management tools and tightened up various components related to implementing and managing Windows and Linux virtual machines, not to mention integrating the whole shebang with the company's virtual desktop initiative, as well as its foundational server-based desktop and application delivery solutions.
Citrix XenServer is a solid server virtualization offering that installs easily, boasts good hypervisor performance, and includes enterprise capabilities such as load balancing and high availability. I did encounter a few snags with the management console and tripped over some issues with the overall solution. There is a lot to like about Citrix XenServer, but it isn't as polished as some of the other options.
This story, "Virtualization shoot-out: Citrix XenServer" was originally published by InfoWorld.