Jan van den Beld, who was promoting Microsoft's legacy OpenXML format at the Geneva BRM for CompTIA, a well know Microsoft lobby group, is using the Technical Barriers to Trade WTO treaty for legal threats to governments:
He also advised governments against mandating just one electronic document standard as it may run foul of World Trade Organization policies and open themselves to possible legal challenges. "One of the big concerns of WTO is that you should not use standards as a barrier to trade," he said.
"If a government enforces [use of just one standard], that would mean the whole country is not allowed to use OpenXML. Then, they could get into a very difficult legal situation as they can be challenged legally," opinioned van den Beld.
Beware governments, you can be sued for not using OOXML.