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Horde Groupware vs Nextcloud Mail: catalog facts
Horde Groupware	Nextcloud Mail
Free Free and open source with no paid tier.	Free Free and open source; installed as an app on a Nextcloud server.
Web, Self-hosted	Web, Self-hosted
Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync	Runs on your own Nextcloud server Works with existing IMAP accounts
Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track	Needs a working Nextcloud installation Does not host mailboxes itself
Self-hosted	Self-hosted
Open source	Open source
License: LGPL/GPL	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 September 24, 2026

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