The Zimbra Collaboration Suite is an open source server and client software solution for messaging and collaboration - email, group calendaring, contacts, and Web document management and authoring. It is designed for and used currently by various enterprises, service providers, and education and government organizations. ZCS 5 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 of Web portals, business applications, and VoIP using Web services. Check out the screen shots below.

• e-Mail
• Calendar
• Admin