ESX Server 3i is the easiest hypervisor to install and use. It's based on VMware's ESX Server code, making it among the most stable and mature virtualisation options available.
Early releases of the Xen hypervisor showed promise but had lots of rough edges. Citrix's XenServer 5, however, is very much a production-class virtualisation solution with features that match, and in some cases exceed, what's available on rival platforms.
Microsoft began a major virtualisation push late yesterday, with the introduction of new virtualisation tools and by making its core hypervisor product free of charge.
Linux vendor Red Hat has bought its way further into the virtualisation market, to compete against VMware, Citrix and Microsoft, with a US$107 million purchase of Qumranet.
The talk of this year's VMworld conference in Las Vegas was how much of a competitive threat Microsoft, which weeks earlier announced the free release of its hypervisor product, will prove to virtualisation leader VMware.
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