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