Windows Server 2008 Release Candidate has shipped, allowing select customers to get a hold of near-finalized code for the program. One major new feature of the new release is Windows Server Virtualization, which will ship as a beta version with Windows Server 2008. Virtualization is the simulation of an actual machine running in a virtualized hardware environment on top of a physical machine which acts as the host. VMware is the current leader in the field in which Microsoft is behind. Windows Server Virtualization, code named Viridian, will ship with Windows Server 2008 in February 2008.