One of the nice things about VirtualBox is it supports virtual disks from alternate VM software. So you can attach a VHD (Windows Virtual PC) or VMDK (VMWare) without having to go through a conversion process. On the other hand, if need to use a VDI (VirtualBox) or VMDK file on Windows Virtual PC, you have to convert them to VHD format.
To accomplish this task, there are few tools which can help:
A walkthrough for converting a VDI to VMDK file using WinImage can be found here. You can then convert the VMDK file to a VHD using the other utility.
Hopefully this isn’t something you have to do much, but it is good to know it can be done in the event you have the need.
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