http://blogs.msdn.com/virtual_pc_guy/archive/2009/06/26/virtualizing-windows-essential-business-server.aspxThanks to Dugie for bringing this to my attention.  We have just published a document that outlines approaches and best practices for running Windows Essential Business Server in a virtual machine.  You can grab it here: http://www.microsoft.com/downloads/details.aspx?FamilyID=933b2eb6-f3bb-47c1-a227-13bb2ccc0a94en-USCommunityServer 2.1 SP1 (Build: 61025.2)