StartWind software is famous company in the world of storage because of their free iSCSI target for Windows systems (which is supported inside VMware, Microsoft and Citrix virtual machines).
The company has recently increased its activity in the virtualization space and released yesterday a free Virtual to Virtual (V2V) migration tool dubbed V2V Converter.
The tool is able to turn a VMware VMDK virtual hard drive into a Microsoft Hyper-V VHD one and vice versa.
If customers want the tool can even convert the vHD in the IMG format that StarWinds uses for its iSCSI Target.
V2V Converter, which performs a sector by sector copy on the selected target, is available without limitation here.