Citrix XenServer Free Edition is available to use at no cost and contains all the features needed to create a virtual infrastructure. The XenServer Free Edition is available for free production use with no restrictions or time limits—all you need to do is activate the product within 30 days of first installing it to register your intent to use it with Citrix. Activation is a simple process that takes only a few minutes.
Three paid-for XenServer Editions — Advanced, Enterprise and Platinum — provide a set of management and automation capabilities that extend the capabilities of the free Citrix XenServer platform. For information about the features available in different XenServer Editions, click here.
All paid editions of the product use Citrix centralized licensing, and you must allocate licenses using a Citrix License Server, just as with other Citrix components. All XenServer Editions licenses must be installed on to a separate Citrix Licensing Server, and maintained and controlled using the Citrix License Management Console. In this way, XenServer shares the same licensing model as other Citrix products, and the licensing server can be shared across other Citrix products. For details of how to install and run Citrix Licensing, look at the online documentation on the Citrix eDocs website.