Sovereign and modern S4B alternative communications platform

Skype for Business Server is retired. What’s next?

Microsoft offers two paths forward: Subscription Edition or Microsoft Teams. Rocket.Chat gives you a third: secure, sovereign collaboration that complements your existing setup.

Flexible deployment. On-prem, private cloud, or air-gapped for data sovereignty.

Enhance Microsoft investments. Chat across Rocket.Chat and MS Teams users.

Unified collaboration. One platform for secure chat, voice and video calls.

Predictable upgrades. Update on your schedule. No multi-step migrations.

Future-ready platform. Evolve with a long-term roadmap, not a temporary pause.

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Deployed by secure organizations globally
The problem

European public sector communications face critical sovereignty challenges

Commercial tools limit sovereignty and control: Public cloud and commercial messaging tools can restrict data sovereignty and control, impacting compliance under European jurisdiction.

Fragmented tools prevent unified European operations: Each agency using different platforms blocks real-time collaboration across borders and between institutions.

Legacy systems block digital transformation: Outdated communication infrastructure prevents secure collaboration while failing to meet modern NIS2 and GDPR standards.

The solution

Secure CommsOS™ for sovereign, 

EU-based collaboration

Unite messaging, voice, video, critical apps, and AI within European-controlled infrastructure. A sovereign platform for all critical communications, from inter-agency coordination and emergency response to cross-border and Member State collaboration.

Sovereign EU-based deployment

Integrate with eIDAS-compliant identity systems, LDAP, and SAML for seamless authentication. Deploy on-premises, in EU sovereign cloud, or air-gapped while maintaining complete control over data and encryption.
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Cross-institution interoperability

Communicate seamlessly with other agencies without switching platforms. Native Matrix federation is built into the Rocket.Chat platform—talk across agencies and institutions without separate servers or vendor lock-in. XMPP compatible.
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Trusted by European institutions

Here's what our European customers and partners say

Supporting real-time collaboration with Member States

“We were looking for a platform that’s easy to use, secure, and hosted in the EU. Rocket.Chat on AWS delivered exactly that.”
Nadia Rosioru
Information Technology Officer, eu-LISA
Unified communications to boost productivity

"Rocket.Chat met our communication needs - secure messaging, audio and video calls, and document sharing. It checked all the security and usability boxes for us."
Jenny Nilsson
IT Strategist, Swedish Electrical SafetyBoard
The control and trust we needed to operate securely

"We wanted to make daily work for our workers as seamless as possible and equip them with the tools they need without compromising on data security and privacy.”
Rene Jahnke
Solution Architect, the City of Cologne
Key use cases

Proven solutions for your most critical collaboration needs

Keep your Microsoft stack. Close the sovereignty gaps. Bridge securely to Microsoft Teams without sending data outside EU jurisdiction. Maintain existing workflows while meeting European data protection and NIS2 requirements.

Open-source transparency for security assurance. Full code auditability and no vendor lock-in. European agencies can review, validate, and customize the platform to meet national security requirements and accreditation standards

Sovereign AI within your infrastructure. Deploy intelligent search, RAG knowledge bases, and multilingual translation entirely on-premises. No external AI dependencies, no data transfer, complete control over classified operations.

Customer story

Hundreds of users,
thousands of messages,
zero compliance gaps

EU-LISA deployed Rocket.Chat to coordinate multi-country testing campaigns for critical EU border systems, replacing slow service desk processes with real-time collaboration.

The impact:

  • Hundreds of users onboarded in 90 days
  • Real-time coordination across Member States
  • Full GDPR compliance with EU-hosted infrastructure
  • Jira integration for seamless project visibility

Instant collaboration across Member States without compromising data protection.

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Have questions? 

Here's what we often hear

How does Rocket.Chat ensure EU data sovereignty?
Is Rocket.Chat compliant with European regulations?
Can we federate with other EU agencies and member states?
How does the open-source model benefit government agencies?
Can we deploy on-premises AI without external dependencies?
What about interoperability with our existing systems?

Don't just take our word for it

Ready for sovereign, 
frictionless communications?

Secure your critical communications with full data sovereignty, seamless cross-border collaboration, and complete compliance—on-premises, in sovereign EU cloud, or fully air-gapped. Trusted by European ministries, defence forces, and public agencies.

Book a 30-min demo