If you use Microsoft Virtual Server 2005 R2 in a test and development or support environment, you probably quickly figured out how to employ differencing and undo virtual hard disks (VHDs) to create hierarchies of virtual machines with incremental configuration variations and rollback capabilities. You can much more easily implement these types of environments using the new Hyper-V snapshot feature, which allows you to capture the configuration and state of a virtual machine at any particular point in time, and provides you with the ability to load any existing snapshot within a matter of seconds.
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