Case Study 1

French Gendarmerie (GendBuntu)

EXEMPLAR SUCCESS

The French Gendarmerie Nationale (national police force) executed a nine-year phased migration of 90,000+ desktops from Microsoft products to an Ubuntu-based open source stack, creating a custom distribution called "GendBuntu." The migration remains operational 17+ years after completion, representing the longest-sustained large-scale government open source deployment in the world.

Status: Complete and sustained operation (2004–present, 21 years)

Classification: Exemplar Success — Longest-running large-scale government open source deployment globally

90,000+ Desktops migrated
17+ years Continuous operation
40% TCO reduction
€34M Cumulative savings

Migration Timeline

Phase Years Technology Change Users Affected Outcome
Phase 1 2004–2006 MS Office to OpenOffice.org 90,000 Microsoft licences reduced from 12,000–15,000 annually to 27 by 2005
Phase 2 2006–2008 IE to Firefox, Outlook to Thunderbird 90,000 Browser and email client standardised on open source
Phase 3 2008–2013 Windows to Ubuntu (GendBuntu) Progressive rollout: 2011: 35,000; 2013: 65,000; 2014: 85,000+ Custom OS deployment with military-grade configuration
Critical Sequencing Decision: The Gendarmerie chose to migrate applications before the operating system, allowing users to become familiar with OpenOffice and Firefox on Windows before changing the underlying OS. This two-year gap between application and OS migration is considered a key success factor.

Technology Stack

Component Solution Notes
Operating System GendBuntu (Ubuntu-based) Custom hardened distribution
Office Suite LibreOffice Migrated from OpenOffice.org post-fork
Web Browser Mozilla Firefox Default browser since 2006
Email Client Mozilla Thunderbird Integrated with organisational email infrastructure
Desktop Environment GNOME (Ubuntu default) Customised for organisational branding
Management Tools Custom deployment infrastructure Centralised management for 90,000+ desktops

Quantitative Outcomes

Strategic Rationale

  1. Cost Reduction: Eliminate recurring Microsoft licensing fees
  2. Vendor Independence: Avoid forced upgrade cycles (Windows Vista announcement was the catalyst)
  3. Hardware Flexibility: Run on older machines, extending hardware lifecycle
  4. Customisation: Ability to tailor the OS for security and operational requirements
  5. Long-term Sustainability: No risk of licence discontinuation
Opportunistic Timing: Microsoft's Windows Vista announcement prompted the OS migration decision. The technical team assessed Vista's hardware requirements and licensing costs, determining that migrating to Linux was more economical.

Training and Change Management

Philosophy: "Users need no training to use a web browser"
Warning The minimal-training approach worked in a military/police context but may not be directly replicable in civilian government organisations where users have greater autonomy over their working practices.

Critical Success Factors

  1. Executive Sponsorship: Full backing from Gendarmerie leadership
  2. Phased Approach: Applications first (2 years), then OS (5 years)
  3. Opportunistic Timing: Vista announcement created a natural decision point
  4. Military Discipline: Hierarchical structure enabled directive implementation
  5. Self-Service Approach: Web-based applications reduced OS dependency
  6. Hardware Independence: Cost-free OS allowed running older equipment
  7. Sustained Political Commitment: 17+ years across government changes

Challenges Encountered

Document Compatibility

Complex MS Office documents occasionally required conversion.

Solution: Maintained approximately 27 Microsoft licences (0.03% of total) for edge cases requiring native format handling.

Application Compatibility

Some Windows-only applications required Wine, virtualisation, or web-based alternatives to function on the Linux desktop.

User Adaptation

An initial productivity dip was observed but was mitigated by the gradual, phased rollout strategy that gave users time to adjust incrementally.

Hardware Drivers

Some specialised equipment lacked Linux drivers, requiring workarounds or hardware replacement in a small number of cases.

Sustainability Analysis — Why It Lasted 17+ Years (Unlike Munich)

  1. National Security Context: As a military/police force, digital sovereignty arguments carried substantially greater weight
  2. Cost Savings Were Real: €2M annually is substantial and measurable, providing ongoing justification
  3. No Political Reversal: No major political change questioning the decision occurred over the entire period
  4. Technical Success: The system works reliably, with no systemic failures that could have prompted reconsideration
  5. Vendor Lobbying Less Effective: National security organisations are less susceptible to commercial lobbying pressure

Replicability Assessment

Factors Favouring Replication

Factors Limiting Replication

Lessons Learned

  1. Applications must precede OS migration. Migrating user-facing applications first reduces the perceived disruption when the operating system changes.
  2. Web-based workflows are key. The more work that runs in a browser, the less the underlying OS matters to end users.
  3. Licence cost elimination is immediate; TCO benefits accrue over 3–5 years. Early savings come from licence fees, but the full cost advantage emerges as hardware lifecycles extend and support costs stabilise.
  4. Low OS requirements enabled hardware lifecycle extension. Linux's lighter resource demands meant existing machines could remain in service longer, compounding savings.
  5. Scale is achievable. 90,000 users is feasible with proper planning, phased rollout, and sustained executive commitment.

Current Status (2026)

Related Documentation

Sources