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Kopano Groupware Core

Open-source collaboration platform with Outlook support

Groupware ★ 60 stars Hard setup AGPL-3.0

Kopano Groupware Core is an open-source collaboration suite providing email, calendaring, and contacts with MAPI compatibility. It serves as the foundation of a self-hosted Exchange alternative.

Official siteSource code

Key features

  • MAPI-based architecture
  • Shared calendars and folders
  • ActiveSync via Z-Push
  • Web-based email client

Pros & cons

Strengths

  • Released under the AGPL-3.0 license
  • First-class Docker support for quick deployment
  • Written in C++

Trade-offs

  • Complex multi-component setup
  • Slower recent development

Is Kopano Groupware Core secure?

OSV.dev has no published security advisories for Kopano Groupware Core's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Kopano Groupware Core replaces

Self-hosted Microsoft Exchange alternatives

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