V2V conversion – linux distro from .vmdk to XenServer .vhd

I am running XenServer for virtualization. I have a linux distro with Big Blue Button (http://bigbluebutton.org/) in .vmdk format that I'd like to run on my XenServer (it uses .vhd files). Problem is that the official tool XenConvert only works if the .vmdk contains a Windows O/S.

Here is the log I received when using the XenConvert tool:

Source is C:\Users\Administrator\Desktop\disk0.vmdk.
Destination is C:\workspace. VMDK to VHD started at den 3 augusti 2011 09:38:08
Converting VMDK to VHD… Dismounting VHD… Failed to get the system
directory. Windows directory is WINDOWS Scanning for BOOT volume…
* Warning! * Failed to find the Windows Boot Volume. VHD
C:\workspace\disk0.vhd was not configured for XenServer. VM may not
boot in XenServer. Dismounting VHD… VMDK to VHD stopped at den 3
augusti 2011 09:44:32

I have tried other tools like Vizioncore Vconverter and StarWind converter, but it seems like there are no V2V tools available that allows a Linux .vmdk to be converted to a Xen .vhd file.

I am wondering if this conversion is possible?