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document updated 15 years ago, on Feb 23, 2009
there tend to be LOTS of good advice in Slashdot discussions
2009-02-23 Citrix XenServer Virtualization Platform Now Free
2008-07-28 VMware ESXi Available For Free Starting Today
2006-02-03 VMware to Make Server Product Free (as in beer)
2005-10-20 VMWare Inc. Releases Free Virtual Machine Runtime