SOGo is a free open-source groupware server with webmail, calendars, and contacts via CalDAV, CardDAV, and ActiveSync. See features and pricing.
SOGo is a free and open-source groupware server that provides webmail, calendaring, and contact management for organizations that prefer to self-host their collaboration infrastructure instead of using a hosted email suite.
The project has a long history, tracing back to the SKYRiX and OpenGroupware.org groupware servers built by Skyrix Software in Magdeburg, Germany. The current SOGo project started in 2004 as a scalability-focused fork, was maintained by the Canadian company Inverse for many years, and has been commercially stewarded by the French company Alinto since 2022.
SOGo exposes calendars, address books, and mail through open standards including CalDAV, CardDAV, GroupDAV, and Microsoft ActiveSync, so it works with native clients like Thunderbird, Outlook, Apple Calendar and Contacts, and mobile devices on iOS and Android.
It reuses existing infrastructure such as Active Directory, OpenLDAP, SQL databases, and IMAP mail servers, which reduces migration effort for organizations that already run this infrastructure. Its AJAX-based web interface supports drag-and-drop, single sign-on via CAS, WebAuth, or Kerberos, and two-factor authentication.
SOGo's core server software is free and open source, released under the GNU GPL and LGPL version 2 licenses, so there is no license fee to install and run it on your own infrastructure. Organizations pay only for hosting and, optionally, commercial support contracts or a hosted variant such as Alinto's SOGomail.
Because pricing is not standardized like a typical SaaS product, actual cost depends on server infrastructure, in-house IT effort for maintenance and upgrades, and whether an organization purchases commercial support from Alinto or another provider.
Yes, SOGo's core groupware server is free and open source under the GNU GPL and LGPL version 2 licenses. You only pay for hosting or optional commercial support.
SOGo supports CalDAV, CardDAV, GroupDAV, and Microsoft ActiveSync, allowing it to sync with Thunderbird, Outlook, Apple Calendar and Contacts, and mobile devices.
SOGo is maintained by its open-source community, with the French company Alinto serving as commercial steward since 2022, following earlier stewardship by the Canadian company Inverse.
SOGo is often used as a self-hosted alternative to Exchange for organizations that want webmail, calendaring, and mobile sync without an Exchange license, though feature parity varies by use case.
Yes, SOGo offers a free connector plugin for Microsoft Outlook in addition to native support for Thunderbird and CalDAV or CardDAV compatible clients.
SOGo typically runs alongside an existing IMAP mail server and can use Active Directory, OpenLDAP, or SQL databases for user accounts.
The core SOGo project is self-hosted, but the commercial steward Alinto offers a hosted variant called SOGomail for organizations that do not want to manage their own server.