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→The Capabilities and Restrictions of Virtual Machine Migration
Firstly, a virtual machine can only be exported if it is shut down or saved. A running or paused virtual machine cannot be migrated. Some readers may be familiar with the live migration capabilities of virtual solutions such as Xen and VMware VMotion which allow a running virtual machine to be moved from one server to another without any perceptible interruption of service. Whilst Microsoft are working on such a feature for Hyper-V, the current version supports only the static migration of a powered off virtual machine.
Secondly, the set of files comprising an exported virtual machine may only be imported by one once into a Hyper-V server. It The reason for this is not possible, therefore, to import that the imported virtual machine will be stored and run from the location from which it was imported. If an exported virtual machine is to be imported into multiple Hyper-V servers, separate copies of the export folder will need to be used for each import.
Thirdly, the Hyper-V Import feature is only able to import Hyper-V based virtual machines. The configuration format used by Virtual Server 2005 and Virtual PC is incompatible with that used by Hyper-V.