The VO & Vulcan dialect is supported both in combination with the Vulcan runtime as well as with the X# runtime.
We have successfully compiled both the Vulcan SDK and applications that depend on this SDK.
The Vulcan Runtime is part of the Vulcan.NET product.
You can download a free trial version of Vulcan.NET from www.govulcan.net and use the runtime that comes with this trial version with X#.
The runtime in the trial version does not have any technical restrictions
Click here for the complete (but short) list of known issues