The Netherlands Tax and Customs Administration plans to move away from Microsoft 365 cloud services, shifting email and calendars on-premises in 2027 and following with European open-source storage and collaboration tools. The reversal shows how sovereignty and security concerns can turn a public-sector cloud migration into a much longer journey home.
Watch Desk analysis
What happened
The authority had selected Microsoft 365 in 2025, but has now abandoned the planned cloud migration. The Register reports that State Secretary for Finance Eelco Eerenberg told parliament email and calendars would move on-premises in 2027, with storage and collaboration services to follow later in 2027 and in 2028. He said increased data-centre capacity made the on-premises option possible, and that existing licences would be reused where possible to limit extra spending.
The rollout had reached about 5,000 of the authority’s 47,500 employees. The Register says the Dutch Advisory Council on ICT Assessment raised concerns about information security, data processing and future-proofing, including dependence on a single supplier and the lack of an exit strategy. The authority is still assessing how to replace Microsoft 365 capabilities that are not available on-premises. Read The Register’s report.
Why it matters
This is a substantial public-sector reversal, not a routine change of software preference. It puts control over infrastructure, sensitive information and long-term supplier dependence at the centre of a migration decision, while the staged timetable makes clear that switching takes years, not a weekend and a stern email.
The practical trade-off is also visible: the authority expects to regain more control, but must find replacements for functions its current package provides. That leaves a real test for European alternatives: can they meet operational needs as well as the political and technical case for greater autonomy?
Our read
The decision makes the exit plan as important as the exit itself. On-premises hosting and European open-source tools are not magic words; the authority still has to deliver secure, usable services and explain how it will handle the features that do not carry over. But this is a concrete example of a large public body acting on concerns about dependency rather than merely adding them to a strategy document.
What to watch
- Whether the authority publishes a clear timetable and replacement plan for services beyond email and calendars.
- How it addresses records-management needs and Microsoft 365 features unavailable on-premises.
- Whether the migration delivers the promised autonomy without creating new operational gaps.
Discussion spark: Should public bodies accept the cost and disruption of moving away from a major cloud provider to gain more control over their systems, or is a well-governed single supplier the safer choice?
Sources and evidence
- Dutch tax office ditches Microsoft 365 cloud for on-premises alternative – The Register (7 October 2026, 11:30 UTC)
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