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MDaemon Email Servergrommunio
Paid

Commercial licence with renewals; a free 30-day trial is available.

 Freemium

Open source, with paid plans listed on the pricing page.

Windows, Self-hosted Linux, Web, Self-hosted
  • Self-hosted alternative to Exchange and Microsoft 365
  • Webmail, groupware and anti-spam in one package
  • Native MAPI, EWS and EAS support for Outlook and mobile clients
  • Mail, calendars, chat, video and files on one platform
  • Runs on Windows only
  • Paid licence with renewal fees
  • Running a groupware server requires administration skills
  • Some features may depend on paid plans
Downloadable app, Self-hosted Self-hosted, Hosted service
Closed source Open source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.