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.
SOGo is standard-compliant and supports CalDAV, ardDAV, GroupDAV 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 Web-based interface that shares the look and feel, the features and the data of Mozilla Thunderbird and Lightning
* Improved integration with Mozilla Thunderbird and Lighthing by using the SOGo Connector and the SOGo Integrator
* Two-way synchronization support with any SyncML-capable devices (BlackBerry, Palm, Windows CE, etc.) by using the Funambol SOGo Connector
and many more! SOGo and our connectors are completely free.