The Netherlands' Tax and Customs Administration has halted its planned rollout of Microsoft 365. This decision stems from growing concerns over digital sovereignty across Europe. A recent Linux Foundation report revealed that 94% of EU organizations consider digital sovereignty important. The Netherlands is now exploring a broader shift from proprietary software to open-source solutions. Initially, the Microsoft 365 rollout was scheduled for completion by the end of 2026. However, an advisory council recommended reversing the public-cloud plan due to significant concerns. These concerns included information security, data processing through American servers, and inadequate encryption for Teams calls. Vendor lock-in and a lack of flexibility were also cited as critical issues. The Dutch government will now pursue an on-premises and open-source approach for mail, calendar, and collaboration tools. Other Dutch agencies are also developing an open-source alternative called DAWO, starting with replacing Windows with Linux.