Zimbra Collaboration Suite
Zimbra Collaboration Suite is an enterprise-class open source email, calendar and collaboration solution which is most affordable, reliable and secure. Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors. In a simple way, Zimbra provides open source email and calendar groupware software, Zimbra is a popular choice for Linux and Mac OS X email servers and supports SaaS deployment, appliances and virtualization platforms
The Zimbra Collaboration Suite is a full-featured system including email, address book, calendar, and web document authoring capabilities. All of your information is stored securely on the Zimbra Merit Mail server, making it easy to access your email, calendars, etc from any computer anywhere in the world.