SUMMARYThe Netherlands’ Tax and Customs Administration has canceled a planned Microsoft 365 public-cloud rollout and will move toward on-premises and open-source alternatives instead. About 5,000 employees had already migrated before the government paused the project in July after an ICT assessment raised concerns about security, digital sovereignty, vendor lock-in, and weak exit options. The replacement plan targets on-premises mail and calendar services in 2027, followed by European open-source tools for storage and collaboration in 2027 and 2028, while other Dutch agencies are also developing an open-source government workspace called DAWO.
An anonymous reader quotes a report from ZDNet: The Netherlands' Tax and Customs Administration has abandoned its planned Microsoft 365 public-cloud rollout. Why? The reasons were clear at the Open Source Summit Europe conference, where the Linux Foundation (LF) released the 2026 State of Open Source in Europe. In it, the nonprofit, pro-open-source organization revealed that 94% of European Union (EU) organizations say digital sovereignty is important, with 61% considering it very important. As Thierry Carrez, the Linux Foundation Europe GM, said in his keynote, "Europe has clearly heard the message on digital sovereignty."
In an interview onstage at the summit, Nithya Ruff, chair of the LF board, added that it's not just Europe: "Digital sovereignty is a need that the entire world feels, whether it's Sierra Leone or the US or China." It's not just the Dutch tax collectors, though. The Netherlands is also exploring switching from Windows and proprietary software to Linux and open-source programs across the board. [...] The Netherlands had planned to switch to Microsoft 365 in 2025. The idea then was to complete the rollout by the end of 2026. About 5,000 employees had already migrated when the Dutch Advisory Council on ICT Assessment recommended reversing the public-cloud rollout in June. The government paused the plan in July; the latest announcement replaces that rollout with an on-premises/open-source approach.
The Tax and Customs Administration isn't replacing all of Microsoft Office with a single open-source suite, at least not yet. Instead, the government will keep the existing Microsoft software for now. Looking ahead, State Secretary for Finance Eelco Eerenberg set out the replacement timetable in a letter to Parliament: "In 2027, the provision for mail and calendar will be realized on-premises. Later in 2027 and 2028, European open-source solutions for personal storage and collaboration will follow. This allows us to work toward a sustainable and more autonomous solution for these functionalities." [...] For now, the on-premises email/calendar environment will still use Microsoft software, including Outlook. The open-source portion concerns personal storage and collaboration, not a wholesale replacement of Word, Excel, PowerPoint, or the entire desktop environment. As for why the Netherlands pulled back, the ICT assessment found serious concerns over "information security, information processing and future-proofing." Key issues included routing confidential documents through American servers, relying on standard Microsoft encryption rather than Double Key Encryption, and inadequate end-to-end encryption for Teams calls. The assessment also identified "vendor lock-in, reduced flexibility, concerns about digital sovereignty, and the absence of an adequate exit strategy" as dealbreakers.
ZDNet notes that other Dutch government agencies are developing an open-source alternative called DAWO (Digital Autonomous Work Environment for Government), which would begin by replacing Windows with the Linux distribution NixOS.