https://www.rijksoverheid.nl/documenten/rapporten/2018/11/07/data-protection-impact-assessment-op-microsoft-office

The Dutch government ordered an assessment of Microsoft Office and its data leaking. It turns out that Office can send data back to Micrisoft on up to 25,000 different events. The information can include sentences for translation (the actual sentence and the one before it and the one after it), email meta data, including the SID (unique identifier in the Active Directory) and the subject line of the email, which can include PII, for instance "RE: Disciplinary action against Joe Bloggs".

After negotiations, Microsoft have agreed to release a compliant version of Office by April 2019. If they delay or the Dutch government feel they aren't responding quickly enough, they will pass it on to the DPO, who will consider other sanctions, inducling fines of up to 4% of Microsoft's global turnover.

Over here it would be illegal to use them in schools. You cannot use any technology that "spies" on children or teachers.

For example there was a "craze" among parents to supply their kids with watches that had a SIM card and the parent could call up the child or listen in to what was being said around them. That is illegal under German law, because the others around them don't know whether they are being listened to, or usually even that there is a possibility that someone will be listening in. The products have since been banned from sale over here and parents had to either return the products or have them destroyed by authorities.

Unless the Alexas had a big sign over them, announcing what they are, and until all parents had agreed to the use of Alexa in the classroom, it would be illegal to turn them on and connect them to the Internet.