Zimbra 4.5.6

Zimbra - Server and client software for messaging and collaboration.

Zimbra is open source server and client software for messaging and collaboration - email, group calendaring, contacts, and web document management and authoring. The Zimbra server is available for Linux, Mac OS X, appliances, and virtualization platforms. The Zimbra Web 2.0 Ajax client runs on Firefox, Safari, and IE, and features easy integration / mash-ups of web portals, business applications, and VoIP using web services. Zimbra Collaboration Suite

Ajax based web collaboration is at the heart of Zimbra Collaboration Suite. The powerful web client integrates email, contacts, shared calendar, VoIP, and online document authoring into a rich browser-based interface. Also, the unique open source Zimlet technology makes it easy for you to include custom 'mash-ups' in the Zimbra web client.

Zimbra Collaboration Suite also includes an elegant Ajax based Admin Interface plus full scripting tools to manage the Zimbra server. Full support is provided for standards-based APIs (IMAP / POP / iCal / CalDAV) as well as MAPI and iSync, which enable seamless compatibility with other clients like Microsoft Outlook, Apple desktop suite, and Mozilla Thunderbird.