grommunio – Open-source groupware and collaboration platform for enterprises
European alternative to Microsoft 365, Microsoft Exchange, and Google Workspace
Central Platform for Communication and Collaboration
grommunio provides a modern open-source platform for email, calendars, contacts, collaboration, and digital communication. Companies benefit from a controllable Linux-based communication and collaboration platform focused on digital sovereignty, data protection, and flexible infrastructure concepts.
The platform combines classic groupware features with modern collaboration services such as email, calendaring, video conferencing, team chat, file management, browser-based office editing, mobile device management, and centralized authentication.
Open-source alternative to Microsoft 365 and Exchange
Many organizations today are looking for alternatives to proprietary cloud and communication platforms. At the same time, requirements for data protection, infrastructure control, digital sovereignty, and Linux-based platform strategies are increasing.
grommunio provides a modern open-source alternative to Microsoft Exchange and Microsoft 365. Companies retain full control over communication data, user management, integrations, and infrastructure.
Technical Architecture and Linux Infrastructure
The technical foundation of grommunio is based on modern Linux and open-source technologies. Typical components include Linux, MariaDB, Redis, Postfix, Nginx, rspamd, and centralized authentication services.
The platform can be operated in traditional, virtualized, containerized, or highly available Linux infrastructure environments.
grommunio-web
Browser-based groupware interface for email, calendars, contacts, and tasks
grommunio-chat
Team chat and messaging platform based on Mattermost
grommunio-meet
Video conferencing and meeting platform based on Jitsi
grommunio-files
File management and collaboration platform based on Nextcloud
grommunio-office
Browser-based office and document editing based on ONLYOFFICE
grommunio-auth
Single sign-on and centralized authentication
grommunio-antispam
Spam filtering and email security based on rspamd
grommunio-MDM
Mobile Device Management for mobile devices
grommunio-archive
Email archiving and compliance based on Mailpiler
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| Advantages of grommunio | Disadvantage of other providers | |
|---|---|---|
| Linux-based open-source groupware | Vendor lock-in and licensing costs | |
| Alternative to Microsoft 365 and Exchange | Strong dependency on Microsoft ecosystems | |
| Controllable infrastructure | Less control over data and systems | |
| Data protection and digital sovereignty | Data often stored outside the EU | |
| Single sign-on and centralized user management | Higher administrative effort | |
| Video conferencing, chat, and collaboration | Additional tools or licenses required | |
| Browser-based office editing | Limited web functionality | |
| Email archiving and compliance | Compliance often only available as add-on | |
| Modular platform architecture | Less flexibility for extensions |
Frequently Asked Questions about grommunio
What is grommunio?Show answerHide answer Action: Open answerClose answer
grommunio is an open-source platform for email, calendars, contacts, collaboration, and digital communication within your own infrastructure.
Is grommunio an alternative to Microsoft 365?Show answerHide answer Action: Open answerClose answer
Yes. grommunio is particularly well suited as a controllable open-source alternative to Microsoft 365 and Microsoft Exchange.
Can grommunio run on Linux?Show answerHide answer Action: Open answerClose answer
Yes. grommunio is especially suitable for Linux-based server and infrastructure environments.
Does grommunio support Single Sign-On?Show answerHide answer Action: Open answerClose answer
Yes. Supported standards and integrations include OpenID Connect, OAuth2, LDAP, Active Directory, and SAML.
Does grommunio support video conferencing?Show answerHide answer Action: Open answerClose answer
Yes. Browser-based video conferencing powered by Jitsi is available through grommunio-meet.
Does grommunio support team chat?Show answerHide answer Action: Open answerClose answer
Yes. A team communication platform based on Mattermost is available through grommunio-chat.
Does grommunio support digital sovereignty?Show answerHide answer Action: Open answerClose answer
Yes. Organizations retain control over communication data, infrastructure, integrations, and security policies.
Integration with XWiki and OpenProject
Especially in combination with XWiki and OpenProject, powerful European open-source collaboration platforms emerge as an alternative to Microsoft 365 and the Atlassian Suite.
XWiki
XWiki is an open-source platform for enterprise knowledge management and documentation.
With grommunio:
Together, they provide a privacy-focused collaboration solution for communication, documentation, and centralized user management.
OpenProject
OpenProject is an open-source platform for project management, task management, and team planning.
With grommunio:
Together, they provide an integrated solution for communication, collaboration, and project management — privacy-focused and fully under your control.
Get a free consultation on grommunio
Further content
Curated follow-up content that deepens this topic in a useful way.
Installation of grommunio – Building Your Own Groupware Platform
Installation of grommunio – Building Your Own Groupware Platform Practical guide including pre-configuration, installation, DNS setup, testing, and forecast 1. Introduction With …
grommunio-auth – Centralized Authentication with Keycloak and Existing SSO
Integration of grommunio into Existing SSO Environments. With grommunio-auth, the platform is extended by an authentication layer.
grommunio-antispam – efficient spam filtering with centralized management and self-learning mechanisms
Integration of Rspamd into production grommunio environments. With grommunio-antispam, the platform is enhanced with a powerful spam filtering component.