The Dutch tax authority is preparing to reduce its dependence on Microsoft 365, planning to move many of its productivity and collaboration tools onto on-premises and open-source alternatives. According to the report, the agency won’t sever ties with Microsoft entirely — it intends to keep using certain tools such as Outlook.
What the Dutch tax authority is planning
The Dutch tax authority, known locally as the Belastingdienst, is working toward a strategy that lowers its reliance on Microsoft’s cloud productivity suite. Instead of hosting everything in Microsoft 365, the plan leans on software that runs on the agency’s own infrastructure and open-source projects that can be self-hosted and modified.
This is a meaningful shift because Microsoft 365 bundles email, calendar, file sharing, and office applications into a single subscription. Moving those workloads off it means the agency would manage more of its own systems, which typically calls for different staffing models, security controls, and long-term maintenance commitments.
Why agencies move away from Microsoft 365
Government agencies across Europe have increasingly cited data sovereignty, cost control, and strategic independence as reasons to cut back on proprietary software. Keeping citizen tax data on systems the agency controls — rather than in a foreign vendor’s cloud — is a recurring argument in these debates.
Open-source tools add further appeal: they allow code to be audited, reduce vendor lock-in, and can be adapted to specific needs. Hosting on-premises keeps data within the organization’s own datacenters, which aligns with the strict requirements that public-sector bodies face around sensitive information.
For context, agencies attempting this kind of transition often look to open-source mail servers, file-sharing platforms, and office suites — the kind of self-hostable projects that have gained traction in the public sector over the past decade. This framing reflects the broader push toward digital independence, though the specific tools the Dutch authority will adopt have not been detailed.
Microsoft tools that will stay
The plan is not a full exit. The authority intends to continue using certain Microsoft products, with Outlook specifically noted as one it will keep. That distinction is worth highlighting: the agency is trimming its broad Microsoft 365 footprint while retaining the email client that many organizations depend on for daily communication.
This partial approach is common when agencies attempt digital transformation. Rather than a risky rip-and-replace, they often keep the tools their staff already know while replacing the rest with alternatives they can control more directly.
A wider pattern in public-sector IT
The Dutch tax authority’s move fits a broader pattern. Public-sector organizations in the EU have been exploring open-source and self-hosted alternatives for years, driven by concerns about cloud concentration and compliance with the General Data Protection Regulation (GDPR). Several national agencies have adopted open-source office suites, mail servers, and file-sharing platforms as part of this shift.
This isn’t an isolated incident — it reflects ongoing discussions about how governments should manage their technology stacks in an era of heightened attention to data privacy and vendor dependence. The Netherlands’ choice adds to a growing list of public bodies testing whether they can run core services without deep dependence on a single proprietary vendor.
What This Means for You
For most individual users, this won’t change anything about how you use Windows or Microsoft 365. The decision is specific to a single government agency’s internal IT strategy, not a change to consumer products you interact with daily.
Still, it is a useful signal for organizations evaluating their own software stacks. It shows that even large, established institutions are willing to reconsider long-standing vendor relationships when cost, control, and data residency become priorities — something IT leaders should keep in mind as cloud spending comes under scrutiny.
What to Do About It
If you manage IT for an organization, this is worth watching as part of your own vendor strategy. Consider where your data lives, how much you depend on a single provider, and whether open-source or on-premises alternatives could meet your needs.
That doesn’t mean abandoning Microsoft — many teams keep Outlook and other familiar tools — but it does mean having a plan for flexibility. Building in the ability to shift workloads can protect your organization against future cost increases, lock-in, or policy changes.
Source: Neowin
Over to you: If your organization could pick one Microsoft 365 tool to keep and one to replace, which would you choose?
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