SOGo vs Zimbra vs EGroupware: Best Self-Hosted Groupware Suites 2026

Self-hosted groupware suites combine email, calendar, contacts, tasks, and collaboration tools into a single platform you control. Instead of relying on Microsoft 365 or Google Workspace, you run the entire stack on your own infrastructure — keeping your data private, avoiding vendor lock-in, and eliminating per-user licensing fees.

This guide compares three mature, actively maintained open-source groupware platforms: SOGo, Zimbra, and EGroupware. We’ll cover their features, architectures, installation with Docker Compose, and help you choose the right one for your organization.

Why Self-Host Groupware?

Running your own groupware server delivers tangible benefits over hosted SaaS alternatives:

• Data sovereignty: Your emails, calendars, and contacts never leave your infrastructure
• Cost savings: No per-user monthly fees — run unlimited accounts on a single server
• No vendor lock-in: Open standards (IMAP, CalDAV, CardDAV, ActiveSync) mean clients connect directly
• Customization: Modify workflows, add integrations, and control every aspect of the deployment
• Compliance: Meet GDPR, HIPAA, or other regulatory requirements by keeping data on-premises

Groupware suites go beyond standalone tools. While you could combine separate email, calendar, and chat servers, an integrated suite provides a unified user experience, shared address books, free/busy scheduling across teams, and centralized administration — all from one interface.

If you’re building a complete email infrastructure from scratch, our complete self-hosted email server guide covers Postfix, Dovecot, and Rspamd in depth. For lightweight calendar and contact syncing without a full suite, check out our Radicale vs Baikal vs Xandikos comparison.

What Makes a Good Groupware Suite?

Before diving into comparisons, here are the core capabilities every groupware platform should provide:

SOGo — Fast, Standards-Based Collaboration

SOGo is developed by Alinto (formerly Inverse) and focuses on speed, standards compliance, and seamless integration with existing infrastructure. It offers calendaring, address book management, and a full-featured webmail client along with resource sharing and permission handling.

Key stats: 2,103 GitHub stars, actively maintained (last commit April 2026), written in Objective-C/SOPE.

SOGo Strengths

• Native client compatibility: Direct connectivity with Microsoft Outlook, Apple Mail, iPhone/iPad, Mozilla Thunderbird, and Lightning — no plugins required
• Standards-first: Uses documented protocols (IMAP, CalDAV, CardDAV, ActiveSync) for maximum interoperability
• LDAP/Active Directory integration: Authenticate and source contacts directly from existing directory services
• High performance: Lightweight architecture handles thousands of concurrent users on modest hardware
• Group scheduling: Free/busy lookups, shared calendars, delegation, and resource booking

SOGo Architecture

SOGo separates its components cleanly:

• SOGo server: The main application handling webmail, CalDAV, CardDAV, and ActiveSync
• SOPE (ScalaGroup Object Publishing Environment): The underlying library providing database abstraction, MIME parsing, and LDAP connectivity
• Memcached: Session caching for fast concurrent access
• Backend databases: MariaDB/PostgreSQL for user preferences and calendar data
• External IMAP/SMTP: SOGo connects to existing Dovecot/Postfix infrastructure — it does not include its own mail transport

SOGo Docker Compose Setup

SOGo’s development team provides a full Docker Compose configuration. Here’s a simplified production-ready version based on their official setup:

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version: "3.8"

services:
  sogo:
    image: sogo/sogo:latest
    container_name: sogo
    restart: unless-stopped
    ports:
      - "80:20000"
    environment:
      - SOGO_DB_URI=postgresql://sogo:sogo_password@postgres/sogo
      - SOGO_LDAP_URI=ldap://openldap:389
      - SOGO_MEMCACHED_HOST=memcached:11211
    volumes:
      - ./sogo.conf:/etc/sogo/sogo.conf:ro
    depends_on:
      - postgres
      - memcached

  postgres:
    image: postgres:16-alpine
    container_name: sogo_postgres
    restart: unless-stopped
    environment:
      POSTGRES_USER: sogo
      POSTGRES_PASSWORD: sogo_password
      POSTGRES_DB: sogo
    volumes:
      - sogo-data:/var/lib/postgresql/data

  memcached:
    image: memcached:1.6-alpine
    container_name: sogo_memcached
    restart: unless-stopped

  dovecot:
    image: dovecot/dovecot:latest
    container_name: sogo_dovecot
    restart: unless-stopped
    ports:
      - "143:143"
      - "993:993"
    volumes:
      - ./dovecot.conf:/etc/dovecot/dovecot.conf:ro
      - sogo-mail:/var/mail

volumes:
  sogo-data:
  sogo-mail:

sogo.conf (minimal configuration):

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{
  SOGoProfileURL = "postgresql://sogo:sogo_password@postgres:5432/sogo/sogo_user_profile";
  OCSFolderInfoURL = "postgresql://sogo:sogo_password@postgres:5432/sogo/sogo_sessions_folder";
  SOGoMailDomain = "example.com";
  SOGoIMAPServer = "imap://dovecot:143";
  SOGoSieveServer = "sieve://dovecot:4190";
  SOGoSMTPServer = "smtp://postfix:25";
  SOGoMemcachedHost = "memcached";
}

Zimbra — Enterprise-Grade Collaboration Platform

Zimbra Collaboration Suite is one of the oldest and most feature-complete open-source groupware platforms. The FOSS edition provides email, calendaring, contacts, tasks, document sharing, and team chat — all through a modern web interface.

Key stats: Active development across multiple repos (zm-build pushed April 2026), Java-based architecture, widely deployed in education and government sectors.

Zimbra Strengths

• Complete platform: Includes everything — mail server, webmail, calendar, contacts, document editor, and admin console in one package
• Web client: One of the most polished open-source webmail interfaces, comparable to Gmail or Outlook Web Access
• Zimlets: Extension framework for adding custom functionality (CRM integration, chat widgets, etc.)
• Multi-server deployments: Designed to scale across multiple nodes for large organizations
• Built-in anti-spam/anti-virus: Integrates Postfix with Amavis, ClamAV, and SpamAssassin out of the box

Zimbra Architecture

Zimbra is a monolithic platform that bundles most of its components:

• Mailbox server (Java): Core application handling email, calendar, contacts, and document storage
• MTA (Postfix): Mail transfer agent with content filtering
• LDAP (OpenLDAP): User directory, configuration, and authentication
• Proxy (nginx): Reverse proxy and load balancer for web traffic
• Spell checker: Aspell-based spell checking
• Store (Lucene): Full-text search indexing
• Antivirus/Anti-spam: ClamAV and SpamAssassin integration

Zimbra Docker Compose Setup

Zimbra’s official Docker setup (from Zimbra/docker-zcs-foss) uses a single-container approach with persistent volume for /opt/zimbra:

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version: "3.2"

services:
  zimbra:
    image: zimbra/zcs-foss:latest
    container_name: zimbra
    restart: unless-stopped
    hostname: mail.example.com
    environment:
      - ZIMBRA_HOST_NAME=mail.example.com
      - ZIMBRA_ADMIN_PASS=YourSecurePassword
    volumes:
      - zimbra-data:/opt/zimbra
    networks:
      default:
        ipv4_address: 10.0.1.3
    ports:
      - "22:22"
      - "25:25"
      - "80:80"
      - "443:443"
      - "143:143"
      - "993:993"
      - "587:587"
      - "7071:7071"

networks:
  default:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 10.0.1.0/24

volumes:
  zimbra-data:

Important notes for Zimbra Docker deployment:

• Zimbra requires a proper hostname that resolves in DNS — it will not run on localhost
• The first installation takes 15-30 minutes as it initializes all components
• The admin console runs on port 7071 (HTTPS)
• A minimum of 8 GB RAM is recommended (16 GB for production)

For a lightweight alternative to full groupware suites, our webmail client comparison covers Roundcube, SnappyMail, and Cypht.

EGroupware — Modular PHP Groupware with Built-In CRM

EGroupware is a PHP-based groupware platform that combines traditional collaboration tools (email, calendar, contacts) with project management, CRM, and document management capabilities. It’s particularly popular among small-to-medium businesses that need a unified platform for both communication and business operations.

Key stats: 290 GitHub stars, actively maintained (last commit April 2026), written in PHP.

EGroupware Strengths

• All-in-one business platform: Beyond email and calendar, includes CRM, project management, time tracking, ticketing, and human resources modules
• PHP-based: Easy to customize and extend with PHP skills — no compilation required
• Rocket.Chat integration: Built-in team chat powered by Rocket.Chat
• Collabora Online: Native integration with Collabora Online for document editing
• Push notifications: Real-time updates via Swoole-based push server
• Modular architecture: Enable only the modules you need

EGroupware Architecture

EGroupware uses a multi-container Docker setup:

• EGroupware application (PHP/FPM): Main application handling all modules
• Nginx: Reverse proxy for web traffic
• MariaDB: Database backend
• Push server (Swoole): Real-time notification service
• Collabora Online: Document editing integration
• Rocket.Chat: Team chat (optional)
• Watchtower: Automatic container updates

EGroupware Docker Compose Setup

EGroupware’s official Docker Compose (doc/docker/docker-compose.yml) is one of the most comprehensive in the groupware space:

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version: "3"

volumes:
  data:
  sources:
  db:
  sessions:

services:
  egroupware:
    image: egroupware/egroupware:latest
    container_name: egroupware
    restart: always
    volumes:
      - sources:/var/www
      - data:/var/lib/egroupware
      - sessions:/var/lib/php/sessions
    environment:
      - EGW_DB_HOST=db
      - EGW_DB_GRANT_HOST=172.%
    depends_on:
      - db

  nginx:
    image: nginx:stable-alpine
    container_name: egroupware-nginx
    restart: always
    volumes:
      - sources:/var/www:ro
      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
    ports:
      - "8080:80"
      - "4443:443"
    depends_on:
      - egroupware
      - push

  db:
    image: mariadb:11.8
    container_name: egroupware-db
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD=YourSecureRootPassword
    volumes:
      - db:/var/lib/mysql

  push:
    image: phpswoole/swoole:latest-alpine
    container_name: egroupware-push
    restart: always
    command:
      - /var/www/server.php
    volumes:
      - sources/egroupware/swoolepush:/var/www
      - sessions:/var/lib/php/sessions
    depends_on:
      - egroupware

For document collaboration alongside your groupware, our Collabora vs OnlyOffice vs Cryptpad comparison covers the self-hosted office suite options.

Feature Comparison Table

Which Should You Choose?

Choose SOGo if:

• You need seamless Outlook and Apple device compatibility with zero plugins
• You already have a mature email infrastructure (Postfix/Dovecot) and want to add collaboration features on top
• You prioritize speed and low resource usage — SOGo runs comfortably on 2 GB RAM
• You value standards compliance (CalDAV, CardDAV, ActiveSync) over feature breadth

Choose Zimbra if:

• You want a complete, turnkey platform with everything included out of the box
• You need a polished webmail interface that rivals Gmail or Outlook Web Access
• Your organization requires multi-server scalability for thousands of users
• You want built-in anti-spam and anti-virus without additional configuration

Choose EGroupware if:

• You need CRM, project management, and collaboration in a single platform
• Your team prefers PHP-based customization over Java or Objective-C
• You want integrated team chat (Rocket.Chat) and document editing (Collabora)
• You’re a small-to-medium business looking for an all-in-one operations platform

FAQ

What is the difference between groupware and a standalone email server?

A standalone email server (like Postfix + Dovecot) handles only email sending, receiving, and storage. A groupware suite adds shared calendars, contacts, tasks, file sharing, and sometimes CRM or project management — all accessible through a unified web interface and synchronized across devices via standard protocols like CalDAV and CardDAV.

Can SOGo replace Microsoft Exchange?

SOGo provides email, calendar, contacts, and task synchronization with ActiveSync and native Outlook support. For many organizations, SOGo combined with an existing mail server (Postfix/Dovecot) can replace Exchange for core collaboration needs. However, SOGo lacks Exchange’s built-in mail transport, anti-spam, and some enterprise features like database availability groups.

Does Zimbra FOSS include ActiveSync?

No — ActiveSync (mobile device synchronization) is available only in the paid Zimbra Network Edition. The FOSS edition supports IMAP, CalDAV, and CardDAV for mobile connectivity, which works with most modern devices but may require manual configuration on some platforms.

Which groupware uses the least server resources?

SOGo has the smallest footprint, running comfortably on a server with 2 GB RAM and 1-2 CPU cores. EGroupware requires approximately 4 GB RAM, while Zimbra needs at least 8 GB RAM due to its Java-based architecture and bundled components (LDAP, MTA, antivirus, spell checker).

Can these groupware suites integrate with existing LDAP/Active Directory?

Yes — all three platforms support LDAP and Active Directory for authentication and user directory sourcing. SOGo has particularly strong LDAP integration, using it for both authentication and as a primary contact source. Zimbra and EGroupware can sync LDAP directories and map external attributes to internal user profiles.

How do I migrate from Google Workspace or Microsoft 365 to self-hosted groupware?

Migration typically involves: (1) exporting emails via IMAP sync tools like imapsync, (2) exporting calendars and contacts as ICS/vCard files and importing via CalDAV/CardDAV, (3) updating DNS MX records to point to your new server, and (4) reconfiguring client devices. Both SOGo and EGroupware provide migration documentation for common source platforms.

Do these platforms support two-factor authentication?

Zimbra includes built-in TOTP-based two-factor authentication in both FOSS and paid editions. SOGo can integrate with external authentication providers that support 2FA through LDAP/PAM. EGroupware supports 2FA through its authentication framework and can integrate with external identity providers.