SOGo
An open-source groupware server with webmail, shared calendars and address books for organisations.
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About SOGo
SOGo is a self-hosted groupware server that sits alongside your existing mail and directory servers. It gives users one web interface for mail, calendars and address books, focuses on open standards, and has been run in production with thousands of users.
Native clients connect over CalDAV, CardDAV and GroupDAV. Built-in Microsoft ActiveSync lets iPhone, Android and other phones sync mail, contacts, events and tasks. Outlook works through the Outlook CalDav Synchronizer, and Thunderbird extensions are available.
Strengths
- Webmail, calendars and contacts in one self-hosted server
- CalDAV, CardDAV and ActiveSync support for native and mobile clients
- Proven in deployments with thousands of users
- Actively released, with version 5.12.11 in September 2026
Limitations
- Needs existing mail and directory servers to integrate with
- Outlook support depends on a separate CalDAV synchronizer
Details
- Pricing
- FreeFree and open source; paid premium support is offered separately.
- License
- GPL-2.0-or-later / LGPL-2.0-or-later
- Developer
- Alinto
- Platforms
- Web, Self-hosted
- How it runs
- Self-hosted
- Best suited for
- Organisations that want self-hosted shared mail, calendars and contacts
- Categories
- Office tools, Email clients
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to SOGo
Compare allSoftware that can replace SOGo for an important use case, and what changes if you switch.
Horde Groupware
A self-hosted open-source PHP suite with webmail, calendar, contacts, tasks and notes.
Horde Groupware is another self-hosted open-source groupware suite with webmail, calendar, contacts, tasks and notes, and CalDAV, CardDAV and ActiveSync sync, running on PHP.
Zentyal
An Ubuntu-based Linux server with Active Directory compatibility, mail and network services for small offices.
Zentyal is a paid Ubuntu-based office server bundling mail and groupware with an Active Directory compatible domain controller, aimed at small offices.
Cyrus IMAP
An open-source email, contacts and calendar server with IMAP, JMAP, CalDAV and CardDAV support.
Cyrus IMAP serves mail, calendars and contacts over IMAP, JMAP, CalDAV and CardDAV from one server, but it has no bundled webmail.
Nextcloud Mail
An IMAP webmail app that runs inside your own Nextcloud server.
Nextcloud Mail provides IMAP webmail that sits next to Nextcloud contacts and calendar on your own server, but it needs a working Nextcloud installation.
Zoho Workplace
An online suite from Zoho combining mail, team chat, meetings, file storage and office editors.
Zoho Workplace swaps a self-hosted server for a hosted suite with mail, chat, meetings and office editors, keeping data on Zoho's servers under a freemium plan.
Roundcube
A self-hosted, browser-based IMAP webmail client written in PHP.
Roundcube covers only the webmail part as a self-hosted PHP client, so shared calendars and ActiveSync sync would need to come from other software.
SOGo as an alternative
Listings that name SOGo as an alternative.
Baïkal
A lightweight self-hosted CalDAV and CardDAV server for syncing your own calendars and contacts.
SOGo adds webmail and shared calendars on top of CalDAV and CardDAV, plus ActiveSync, but it needs existing mail and directory servers to integrate with.
Cypht
Self-hosted open-source webmail that combines several email accounts and RSS feeds into one inbox.
SOGo is a groupware server with webmail, shared calendars and address books for organisations, and needs existing mail and directory servers to integrate with.
Radicale
A small self-hosted CalDAV and CardDAV server for keeping calendars and contacts on your own machine.
SOGo is a larger self-hosted groupware server adding webmail and ActiveSync to CalDAV and CardDAV, but it needs existing mail and directory servers to integrate with.
SnappyMail
A lightweight self-hosted webmail client, forked from RainLoop and rebuilt for modern browsers.
SOGo provides webmail plus shared calendars and address books with ActiveSync support for organisations, but needs existing mail and directory servers to integrate with.
Similar software
Related functionality, not necessarily a direct replacement.
Mailcow
Dockerized open-source mail server suite with web admin and webmail.
Dovecot
An open-source IMAP and POP3 server that stores mailboxes and serves them to mail clients.
Evolution
GNOME's mail, calendar, contacts and tasks suite, and the usual answer for Exchange on Linux.
Stalwart
Rust-based all-in-one mail server supporting JMAP, IMAP, and SMTP.
Thunderbird
Mozilla’s desktop mail client, with calendar, contacts and a unified inbox, funded by donations rather than ads.
