Why use SOGo?

There are a number of reasons why SOGo should be your preferred groupware solution over alternatives such as Microsoft Exchange or Zimbra.

SOGo and all its related components (Mozilla Thunderbird plugins, Funambol SOGo Connector, etc.) are entirely free and released under the GPL (or LGPL/MPL)
Other solutions, like Zimbra, offer limited branding capabilities when using the "free" version
Microsoft Exchange and Zimbra can cost between 30 $US and 115 $US per user, per year, for environments as small as 1,500 users. This means you can pay between 44,000 $US and 105,000 $US per year in licensing fees . With the native Microsoft Outlook compatibility layer SOGo offers, you can connect all your Outlook 2003, 2007 and 2010 clients at no cost!
Other solutions that provide you with Microsoft Outlook compatibility require you to install and maintain complex MAPI connectors on all computers that use Outlook

SOGo provides you with a coherent environment with Mozilla Thunderbird and Lightning
Its web interface is simple and professional looking. AJAX is not over-used like other solutions, which makes SOGo's web interface very fast
Solutions like DAViCal or Apple Calendar and Contacts Server provide no Web interface and no support for Microsoft Outlook

SOGo supports and promotes open standards such as CalDAV, CardDAV, CalDAV auto-scheduling, WebDAV Sync, WebDAV ACLs and more
In SOGo, every single event, task, contact or email can be accessed through the DAV protocol. This provides excellent scripting capabilities
Apple extensions such as calendar colors, calendar delegation and more are well-supported, making SOGo a transparent Calendar and Contacts Server

SOGo is very fast and uses few resources. SOGo is a compiled software so the required hardware footprint is very low
A single SOGo server can easily handle thousands of users
SOGo's speed not only comes from its elegant architecture but also from its use of an efficient and distributed cache mechanism

SOGo reuses your existing services such as Microsoft Active Directory, OpenLDAP, your SQL database, or even your IMAP server. By reusing those, SOGo prevents you from time-consuming data migration or directory services data duplication or synchronization problems
If you have little or no existing services, ZEG can be used for immediate deployments. ZEG will get you running in minutes
SOGo provides you with migration scripts from existing solutions and more scripts are being added

SOGo is available as packages for multiple operating systems such as Debian, Ubuntu, Red Hat Enterprise Linux and CentOS
SOGo is also under active development and update processes are trivial and can be done with virtually no downtime