Now if you copied over a VHD from Virtual Server 2005 to Hyper-V, you will most likely see the error The IP address you have entered for this network adapter is already assigned to another adapter (microsoft Virtual machine Bus Network Adapter) which is no longer present in this computer. There are a few reasons [...]

In virtual server 2005, you could copy VHDs among different folders and virtual servers no problem. With Hyper-V if you tried this, you will get an error similar to: The file d:\virtual machines\disk.vhd does not have the required security settings. What you need to do is deattach the VHD file from the virtual server settings, [...]