The Dutch tax office is moving away from Microsoft 365 cloud services and toward servers it controls, along with open-source software, in a decision announced Wednesday, October 7, 2026. It is the Netherlands’ tax and customs administration. Some timeline, software, hardware and savings details below come from leaks and supply-chain reports and haven’t been officially confirmed.
Why the Dutch Tax Office Is Leaving Microsoft’s Cloud
The decision reportedly covers the Belastingdienst, Dutch Customs and the Benefits Agency, rather than one department. Email and calendar systems are reportedly set to move to agency-controlled servers during 2027, with personal storage and collaboration tools following later in 2027 and throughout 2028. That would reverse a policy the Dutch finance ministry announced in October 2025, when it called Microsoft 365 the only workable and realistic workplace option.
A government ICT review later reportedly challenged that conclusion. By January 2026, about 5,000 of roughly 47,500 employees had reportedly moved to Microsoft 365. The review board reportedly found that the existing plan wouldn’t create a suitable workplace. State Secretary for Finance Eelco Eerenberg then reportedly revisited the decision in June and paused the rollout on July 9. As Thenextweb first reported, the new direction puts more control over sensitive public-sector systems at the center of the plan.
The Reported On-Premise Specifications
The proposed replacement pairs local infrastructure with open-source productivity software. LibreOffice version 26.2 is listed as the office suite that would replace Microsoft Office applications on agency workstations, while servers with AMD enterprise processors would provide the core computing platform.
The reported infrastructure includes 512 GB of DDR5 RAM per replacement server node. Each rack would also carry a 100 TB NVMe solid-state drive configuration, giving the administration a sizable local storage pool for documents, collaboration data and related services. The broader plan is reportedly due to finish by December 31, 2028, with estimated annual savings of €45 million from ending Microsoft 365 licensing costs. Those figures haven’t been officially confirmed, so they shouldn’t be treated as final procurement specifications or guaranteed public savings.
| Area | Reported direction |
|---|---|
| Productivity suite | LibreOffice 26.2 |
| Server platform | AMD enterprise processors |
| Memory per node | 512 GB DDR5 |
| Storage per rack | 100 TB NVMe |
| Target completion | December 31, 2028 |
Three Paths for a Public-Sector Workplace
The first option is a fully managed Microsoft 365 environment. It provides mature email, calendars, document sharing and collaboration, but it also leaves the agency dependent on a commercial cloud provider and recurring license costs. The earlier migration reportedly showed the danger of choosing a workplace model before the government’s ICT review had finished.
The second option is a fully local, open-source stack. It would give the Netherlands more control over data location, software choices and long-term licensing, while the Microsoft defines Azure discussion illustrates why cloud infrastructure remains central to enterprise technology. The trade-off is operational responsibility: the agency would need to manage updates, security, compatibility and support for thousands of employees. A third option would combine local servers for sensitive workloads with selected cloud services for less critical collaboration. That hybrid approach could lower migration risk, but it would leave the agency with two environments to secure and maintain. It could also reduce the savings if too many commercial subscriptions stay active.
What Happens Next
The first test will be whether email and calendars can reportedly move in 2027 without interrupting public services. After that, the agency will need to address document compatibility, staff training and support for open-source applications across a workforce of about 47,500 people.
For highly sensitive records, local infrastructure is the stronger choice if the Netherlands can fund long-term maintenance and security expertise. For less sensitive collaboration, a hybrid model may prove safer if a full open-source transition creates operational strain. The clearest approach is straightforward: use local servers for controlled data, and keep cloud tools only where their value outweighs their dependency and licensing costs.
The Dutch tax office is betting that software independence can provide more control than a rapid cloud migration; the 2027 transition will show whether that trade-off works in practice.
FAQs
Why is the Dutch tax office leaving Microsoft 365?
The agency reportedly paused its cloud migration after a government ICT review found that the planned workplace wouldn’t be suitable. It is now pursuing controlled servers and open-source software.
Which software could replace Microsoft Office?
The reported replacement is LibreOffice version 26.2. Its final deployment status hasn’t been officially confirmed.
When will the migration finish?
The reported target is December 31, 2028, although the timeline remains unconfirmed. Email and calendars are reportedly scheduled to migrate during 2027.
How much could the Netherlands save?
The reported estimate is €45 million each year in Microsoft 365 licensing costs. That figure hasn’t been officially confirmed. Source: Thenextweb
Was this article helpful?
Your feedback directly improves future articles on this site.
