Compare software

Zimbra vs b1gMail: catalog facts
Zimbra	b1gMail
Paid Sold in several editions under Zimbra's license terms; see the edition comparison.	Free Free and open source under the GPL-2.0 licence.
Web, Self-hosted	Web, Self-hosted
Mail, calendar and contacts in one web client Can be run on your own servers	Runs on shared web hosting with PHP and MariaDB Web admin panel for managing users and the service
Aimed at organisations rather than individuals Running a mail server takes administration effort	Shared-hosting mode relies on POP3 catch-all mailboxes Community site and documentation are partly in transition from the old website
Self-hosted, Hosted service	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
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
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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