The Inverse Team is pleased to announce the immediate availability of SOGo v4.0.0. This is a major release of SOGo which focuses on new features and improved stability over previous versions.

     What is SOGo

SOGo is a free and modern scalable groupware server. It offers shared calendars, address books and emails through your favorite Web browser or by using a native client such as Mozilla Thunderbird and Lightning, Apple Calendar and Address Book (macOS and iOS) and Microsoft Outlook.

SOGo is standard-compliant and supports CalDAV, CardDAV and reuses existing IMAP, SMTP and database servers - making the solution easy to deploy and interoperable with many applications.

SOGo features:

 * Scalable architecture suitable for deployments from dozen to many
   thousand users
 * Rich, responsive Web-based interface aligned with Google Material
   Design guidelines
 * Improved integration with Mozilla Thunderbird and Lightning by using
   the SOGo Connector and the SOGo Integrator
 * Compatibility for Microsoft Outlook 2007, 2010, 2013 and 2016

   Two-way synchronization support with any Microsoft
   ActiveSync-capable devices (Apple iOS, Android, Windows Phone,
   BlackBerry 10) or Outlook 2013/2016

 * Excellent native integration with Apple software (macOS and iOS) and
   Android-based devices

and many more! SOGo and our connectors are completely free.

     Changes from the previous release

*New features*

 * [core] full S/MIME support
 * [core] can now invite attendees to exceptions only (#2561)
 * [core] add support for module constraints in SQL sources
 * [core] add support for listRequiresDot in SQL sources

   [web] add support for SearchFieldNames in SQL sources

 * [web] display freebusy information of owner in appointment editor
 * [web] register SOGo as a handler for the mailto scheme (#1223)
 * [web] new events list view where events are grouped by day
 * [web] user setting to always show mail editor inside current window
   or in popup window
 * [web] add support for events with recurrence dates (RDATE)


 * [web] follow requested URL after user authentication
 * [web] added Simplified Chinese (zh_CN) translation - thanks to
   Thomas Kuiper
 * [web] now also give modify permission when selecting all calendar rights
 * [web] allow edition of IMAP flags associated to mail labels
 * [web] search scope of address book is now respected

   [web] avoid redirection to forbidden module (via ModulesConstraints)

 * [web] lower constraints on dates range of auto-reply message (#4161)
 * [web] sort categories in event and task editors (#4349)
 * [web] show weekday in headers of day view
 * [web] improve display of overlapping events wi

*Bug fixes*

 * [core] yearly repeating events are not shown in web calendar (#4237)
 * [core] increased column size of settings/defaults for MySQL (#4260)
 * [core] fixed yearly recurrence calculator with until date
 * [core] generalized HTML sanitization to avoid encoding issues when
   replying/forwarding mails
 * [core] don't expose web calendars to other users (#4331)
 * [web] fixed display of error when the mail editor is in a popup
 * [web] attachments are not displayed on IOS (#4150)
 * [web] fixed parsing of pasted email addresses from Spreadsheet (#4258)
 * [web] messages list not accessible when changing mailbox in expanded
   mail view (#4269)
 * [web] only one postal address of same type is saved (#4091)
 * [web] improve handling of email notifications of a calendar properties
 * [web] fixed XSRF cookie path when changing password (#4139)
 * [web] spaces can now be inserted in address book names
 * [web] prevent the creation of empty contact categories
 * [web] fixed mail composition from message headers (#4335)
 * [web] restore messages selection after automatic refresh (#4330)
 * [web] fixed path of destination mailbox in Sieve filter editor
 * [web] force copy of dragged contacts from global address books
 * [web] removed null characters from JSON responses
 * [web] fixed advanced mailbox search when mailbox name is very long
 * [web] fixed handling of public access rights of Calendars (#4344)
 * [web] fixed server-side CSS sanitization of messages (#4366)
 * [web] cards list not accessible when changing address book in
   expanded card view
 * [web] added missing subject to junk/not junk reports
 * [web] fixed file uploader URL in mail editor
 * [web] fixed decoding of spaces in URL-encoded parameters (+)
 * [web] fixed scrolling of message with Firefox (#4008, #4282, #4398)
 * [web] save original username in cookie when remembering login (#4363)
 * [eas] hebrew folders encoding problem using EAS (#4240)
 * [eas] avoid sync requests for shared folders every second (#4275)
 * [eas] we skip the organizer from the attendees list (#4402)
 * [eas] correctly handle all-day events with EAS v16 (#4397)
 * [eas] fixed EAS save in drafts with attachments

See closed tickets and the complete change log.

     Getting SOGo

SOGo is free software and is distributed under the GNU GPL. As such, you are free to download and try it by visiting the following page:

You can also download the sources by following the instructions on this page:

Front-end clients such as Mozilla Thunderbird, Mozilla Lightning (Inverse Edition), SOGo Connector and SOGo Integrator extensions are available for download from:

Documentation about the installation and configuration of SOGo, Thunderbird or the native Microsoft Outlook compatibility layer is available from:

You can also try our online SOGo demo at:

     Upgrading to v4.0.0

When upgrading form SOGo v3.2.10 to SOGo v4.0.0, please run thesql-update-3.2.10_to_4.0.0.shscript if you are using PostgreSQL orsql-update-3.2.10_to_4.0.0-mysql.shif you are using MySQL/MariaDB.


SOGo is a collaborative effort in order to create the best Free and Open Source groupware solution.

There are multiple ways you can contribute to the project:

 * Documentation reviews, enhancements and translations
 * Write test cases - if you know Python, join in!
 * Feature requests or by sharing your ideas
 * Participate to the discussion in mailing lists

   Patches for bugs or enhancements (


   Provide new translations

Feel free to send us your questions. You can also post them to the SOGo mailing list:

     Getting Support

For any questions, do not hesitate to contact us by writing <>

Customer support packages for SOGo are available from

Ludovic Marcotte  ::  +1.514.755.3630  ::
Inverse inc. :: Leaders behind SOGo (, PacketFence 
( and Fingerbank (


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