Compare software

SOGo vs Zimbra: catalog facts
SOGo	Zimbra
Free Free and open source; paid premium support is offered separately.	Paid Sold in several editions under Zimbra's license terms; see the edition comparison.
Web, Self-hosted	Web, Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Mail, calendar and contacts in one web client Can be run on your own servers
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Aimed at organisations rather than individuals Running a mail server takes administration effort
Self-hosted	Self-hosted, Hosted service
Open source	Closed source
License: GPL-2.0-or-later / LGPL-2.0-or-later	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
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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