You may want to try ArcGIS for Server but may not have a free machine or may have a Mac OS X machine, which the product does not support yet. Perhaps you do not want to install Server on a production environment until you simulate the entire setup. If either of this is the case, you can use the virtualization track installation. This track will walk you through setting up and cloning virtual machines. We will be using the open source Oracle Virtual Box to set up three Windows Server 2008 R2 virtual machines. Then, you can follow the same installation tips we discussed in the Production Installation Track section.
You can also use VMWare vSphere 4 and 5 as they are supported.