An enterprise communication infrastructure —
more than groupware.
grommunio is a Linux-based enterprise communication infrastructure built for organizations that require control, compliance and long-term independence. It combines secure email, directory integration and real-time collaboration into a unified, standards-based system designed for complex IT environments.
Why organizations evaluate alternatives to established platforms
Many organizations evaluate platforms such as Microsoft 365 or Microsoft Exchange when reassessing their collaboration infrastructure, driven by factors such as:
- Jurisdictional risks
- Dependency on hyperscale cloud providers
- Regulatory and compliance requirements
- Vendor lock-in concerns
- Long-term cost control
In such evaluations, organizations often assess which collaboration platforms are based on open standards and can be operated independently. grommunio lets organizations keep using Microsoft Outlook while supporting widely used Exchange communication protocols — without requiring Exchange Online.
Built on open, standards-driven foundations
grommunio is built on a hardened Linux foundation and follows an open, standards-driven architecture — ensuring interoperability, scalability and long-term infrastructure flexibility.
- Microsoft Outlook integration via MAPI / HTTP, EWS and ActiveSync
- Open email standards
- LDAP & Multi-LDAP directory integration
- Centralized administration
- Modular service architecture
- Scalable multi-tenant capability
- Exchange ActiveSync support
- Standards-based interoperability
Engineered for regulated, compliance-sensitive organizations
- Transparent open-source codebase
- Data processing within your chosen jurisdiction
- Controlled update and maintenance cycles
- Enterprise-grade authentication and authorization
- Optional archiving and device management
Suitable for government and public administration, healthcare, financial institutions, critical infrastructure operators and compliance-driven enterprises — scalable from SMEs to large organizations.
What grommunio stands for
Open source
Fully OSI-compliant and auditable — without backdoors or telemetry transmission.
GDPR, CCPA & ePrivacy compliant
Built for full compliance with the world's strictest data-protection laws.
Secure
Confirmed by bounty runs and independent security research.
Digital sovereignty
No dependency on remote infrastructure, with full control over your managed data.
Why organizations choose grommunio
Reduced cost
No separate licensing of individual components — better use of existing infrastructure, better ROI and TCO.
Compatibility
Use the clients of your choice with the full feature set those clients make available.
Performance
Make the most of your productivity — limited only by what your infrastructure can deliver.
Unified management
No separate management per component — one interface to rule them all.
Control
Store your data exactly where it belongs, without data-governance issues.
See it in action