You are behind the curve. You read here first. Lets revisit this comment in 2 years...

This will be overturned by both Dutch and European courts after the company appeals, and specially after Mark Rutte Daddy calls. The only purpose of this action is for the Dutch government to save face, and its for internal consumption. They already have the internal legal advice stating this, hidden away in some closet. But then they will say: You see, we wanted to do it but a court blocked us.

>>Of course there's still plenty of sensitive data in the hands of Microsoft, Amazon and other US companies.

The WHOLE Dutch diplomatic and broader civil service, including the Ministry of Foreign Affairs, runs extensively on Microsoft infrastructure for its daily operations, cloud services, and email. And they leak....

"Microsoft Accused Of Sharing Dutch Officials’ Data with U.S. Government" - https://www.yahoo.com/news/politics/articles/microsoft-accus...

This will also be the core legal argument by the appealing company. They will argue that the decision was politicized, insufficiently reasoned, or disproportionate because binding technical/legal safeguards would have solved the risks... And they will use as example, the diplomatic service extensive use of Microsoft :-)

So is nothing more than another Polder hypocritical take, by the Dutch government.