Ariba On-Premise does not officially support Windows Hypervisor. You can read our policy rgarding virtualization in the On-Prmise compatibuility matrix.
Virtualization really does not apply in the on-demand world (e.g, you only use a browser to access our application and we claim compatibility to a browser). It may if you have a specific use case (e.g., integration using ITK), so if you clarify the use case for On-Demand then we can answer appropriately.
For reference, which company / Ariba customer are you associated with?
Thanks,
- Jason