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SOGo vs Xandikos: catalog facts
SOGo	Xandikos
Free Free and open source; paid premium support is offered separately.	Free Free and open source under the GPL-3.0 licence.
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	Git-backed storage with change history Broad, documented standards coverage
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	No built-in web interface for managing calendars WebDAV LOCK operations not implemented
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License: GPL-3.0
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 2, 2026

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