Compare software

MDaemon Email ServerZimbra
Paid

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

 Paid

Sold in several editions under Zimbra's license terms; see the edition comparison.

Windows, Self-hosted Web, Self-hosted
  • Self-hosted alternative to Exchange and Microsoft 365
  • Webmail, groupware and anti-spam in one package
  • Mail, calendar and contacts in one web client
  • Can be run on your own servers
  • Runs on Windows only
  • Paid licence with renewal fees
  • Aimed at organisations rather than individuals
  • Running a mail server takes administration effort
Downloadable app, Self-hosted Self-hosted, Hosted service
Closed source Closed 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.