During the keynote Synergy 2010 in San Francisco, Citrix has made public the version 5.6 of its XenServer hypervisor in this new release as well as new features are also a very important change in licensing.
Since its inception XenServer has undergone many changes from the commercial point of view: first time to fully charge, then to counter the other enterprise hypervisor is free but with certain features become available with tools to pay (Essential for Citrix XenServer), now with 5.6 are new editions (the trend of adding editions seem very close to that of other competitors).
