I have a conversation with P Oud regarding to our Microsoft "Enterprise Agreement" which covers the licenses mainly for core CALs and Offices. Windows servers' are normally obtained via Microsoft "Select" per project basis. Our current agreement is applied to affiliates under SCG's executive (management) control with ownership of at least 10%.
I also asked Metrosystem, partner of Microsoft, to help on this case. Sales representative will contact SUS directly to give advice on the product key under the open license as per mentioned.