European Digital Sovereignty

End Dependency on
US-Governed Tech.

We architect the migration of European public and private sectors from proprietary US platforms to high-performance, sovereign alternatives. Secure, compliant, and under your absolute control.

• Microsoft 365 De-risking• Nextcloud Implementation• openDesk Architecture• GDPR Sovereign Audit• Element/Matrix Security• Univention Identity• Digital Autonomy Advisory
• Microsoft 365 De-risking• Nextcloud Implementation• openDesk Architecture• GDPR Sovereign Audit• Element/Matrix Security• Univention Identity• Digital Autonomy Advisory
Risk Assessment

The Cost of Inaction

Proprietary US tech is no longer just a vendor choice — it's a jurisdictional liability for European entities. Click any card to learn more.

The US CLOUD Act

US authorities can compel American providers to hand over data stored anywhere globally. European residency offers no legal protection under US jurisdiction.

The Clarifying Lawful Overseas Use of Data Act (2018) grants the US government sweeping powers to demand data from any US-headquartered company — regardless of where that data physically sits.

In June 2025, Microsoft France confirmed to the French Senate that it cannot guarantee European data sovereignty. No contractual promise or EU data centre location changes this legal reality.

Real World Impact

UK public sector data hosted in Microsoft's cloud infrastructure can be processed in more than 100 countries — Computer Weekly, 2025.

Geopolitical Exposure

Recent incidents have proven that US platforms can and will be weaponized for political leverage. Your core infrastructure should not be subject to foreign policy shifts.

In May 2025, Microsoft blocked the email account of Karim Khan — Chief Prosecutor of the International Criminal Court — following US sanctions. A sovereign international judicial institution lost access to its communications with no prior warning and no recourse.

This wasn't a data breach or a hack. It was a US corporation exercising legal compliance with its home government — at the expense of a European institution.

The Pattern

France, Germany, the Netherlands and Spain have all accelerated sovereign tech programmes directly in response to this incident.

Operational Lock-in

Monopolistic ecosystems create technical debt that compounds daily. Breaking the cycle requires expert architectural intervention, not just new software.

Microsoft holds up to 77% of EU public sector productivity software, with shares reaching 90–92% in office productivity software across specific Member States. Every year of continued dependency deepens the migration cost.

Lock-in isn't just technical — it's workflow, habits, file formats, permissions structures, and institutional muscle memory built over decades. Migration requires change management as much as engineering.

Our Approach

We use a continuous sync migration model — zero downtime, cohort-by-cohort cutover, full permission integrity preserved throughout.

How We Work

Our Method

We don't just point you at open source software. We manage the entire journey from your first discovery conversation to full deployment and ongoing support.

01

Discovery & Sovereignty Audit

We map your entire US technology dependency — every Microsoft and Google touchpoint across your organisation. You receive a clear picture of your exposure and a prioritised migration roadmap.

02

Managed Migration

We run your migration using a continuous sync model — not a risky lift-and-shift. Both environments run simultaneously. Teams move in cohorts. Zero downtime. No lost data. Full permission integrity preserved.

03

Change Management & Training

The technology is the easy part. We manage the human side — translating years of Microsoft muscle memory into sovereign stack workflows, with role-specific training for every level of your organisation.

04

Ongoing Support & Advisory

Post-migration support contracts and strategic advisory for organisations building long-term digital sovereignty programmes. We stay with you as the stack evolves.

The Solution Architecture

The Sovereign Stack

We replace every layer of the US productivity stack with enterprise-grade, European-owned alternatives.

Identity

Univention

Central identity and access management. Federates with existing Active Directory and Entra ID — your users keep their existing credentials during migration.

Replaces Entra ID
Collaboration

Nextcloud

File sync, sharing, and content collaboration hosted in Europe. France's Ministry of Education has 400,000 employees on Nextcloud — targeting 1.2 million.

Replaces OneDrive
Communication

Element

End-to-end encrypted messaging via the open Matrix protocol. Used by the French government (5.5M civil servants), German Bundeswehr, and the European Commission.

Replaces Teams
Office Suite

Office EU

Full document, spreadsheet, and presentation editing. Native .docx and .xlsx compatibility. Nexus MSP is one of the UK's first official Office EU implementation partners.

Replaces Office 365
The Complete Picture

One Platform.
Absolute Sovereignty.

We integrate these best-of-breed tools into a unified workplace experience — openDesk — the German government-backed sovereign workplace suite. Delivering the usability of M365 without the jurisdictional risk.

View our implementation methodology
openDesk
Sovereign Workplace
German Federal Gov backed
Open-Xchange
Email & Calendar
Replaces Outlook
Euro-Office
Document Editing
Launched March 2026
OpenProject
Project Management
Replaces Jira & Planner
The Nexus Advantage

Expertise forged in
Government infrastructure.

01

UK Central Gov Pedigree

Our architects have delivered transformation projects for the Cabinet Office and major public sector departments across the UK.

02

Premier Office EU Partners

As one of the UK's first official Office EU partners, we have direct access to core developers and roadmap influence.

03

Contingent Labour Model

Access top-tier senior expertise on-demand. No heavy permanent headcount, just mission-focused delivery.

77%

M365 EU Dominance

The current risk surface across EU public sector.

200k

Civil Servants

Already mandated to migrate in France by 2027.

£0

Licence Fees

Invest in expertise, not software rent.

100%

Sovereign Control

Zero US jurisdiction. Your data, your rules.

Ready for
Digital Autonomy?

We begin with a high-level Sovereignty Audit to map your current US dependencies. No obligation — just a clear view of your exposure and a path to independence.