BobB writes "Oracle is going after its piece of the hot virtualization market by introducing an open source Xen-based hypervisor to compete against those from Novell, Red Hat, and VMware. Oracle VM, unveiled Monday at the Oracle OpenWorld convention in San Francisco, enables virtualization on Oracle and non-Oracle software applications and on the Linux and Windows OSs. It also operates on industry-standard x86- and x86-64-based servers. Oracle claims it offers virtualization at a lower cost than competitors can." VMware stock dropped over 10% on the news; Oracle's stock rose. The market was not punishing Oracle for the unpatched zero-day vulnerability (public exploit available) that the company won't patch until Jan. 15.