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Physical or virtual to Hyper-V requirements

Use these requirements if your source is a physical or virtual server, you want to protect the volumes from the physical server or volumes from within the virtual guest operating system, and your target is an automatically provisioned virtual server on a Hyper-V server. This means Double-Take Availability will automatically create the virtual server on the Hyper-V target if failover is triggered.

Source server—The source server can be any physical or virtual server running any of the operating systems listed in the General source and target server requirements. However, if you are using a Windows 2003 operating system, you must have Service Pack 2 which is required for Hyper-V Integration Services.
Target server—The target server can be any Windows 2008 or 2008 R2 operating system from the supported server operating systems that has the Hyper-V role enabled. In addition, you can use Hyper-V Server 2008 R2 or Server Core 2008 R2 with the Hyper-V role enabled. (Hyper-V Server 2008 and Server Core 2008 are not supported.)