Citrix was apparently planning to let the world know during VMware VMworld Europe next week, but a personal blog entry let the cat out of the bag—XenServer will be a free product starting next week.

According to a blog entry at, the full Enterprise Edition of XenServer will be free. Citrix will attempt to make up the lost revenue by releasing Citrix Essentials, a management package.

XenServer joins VMware and Microsoft hypervisors already available for free.