Much of the talk about shifting paradigms in IT involves infrastructure, with folks focusing on software-as-a-service and its newer variants such as cloud computing. Meanwhile, a fundamental shift is also occurring at the application level. As IT Business
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.