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SOGo vs Horde Groupware: catalog facts
SOGo	Horde Groupware
Free Free and open source; paid premium support is offered separately.	Free Free and open source with no paid tier.
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	Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License: LGPL/GPL
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 September 23, 2026

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