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SOGo vs Cyrus IMAP: catalog facts
SOGo	Cyrus IMAP
Free Free and open source; paid premium support is offered separately.	Free Free and open source.
Web, Self-hosted	Linux, Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Mail, calendars and contacts in one server JMAP support alongside IMAP
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Complex to configure compared with all-in-one servers No bundled webmail
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License not stated
Not stated if an account is needed	No account 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.