Best Practices for Virtualizing and Protecting Exchange Server
As is the case with most Microsoft products, Microsoft provides a number of requirements and best practice guidelines for running Exchange Server in a virtualized environment. While there is no denying the importance of adhering to these requirements, it is also important to read between the lines and understand the spirit of the recommendations that Microsoft makes. Doing so will allow you to virtualize Exchange Server in a way that will provide optimal performance, stability and fault tolerance.
Today, the reality is that the resources are in place to virtualize Exchange successfully on vSphere and Hyper-V.