Do you use Microsoft Outlook for mails and other stuff? Interested in seeing its web based version? Well, it does not belong to Microsoft by any ways but it is an open source application, Zimbra, it is a sleek web based application with great use of AJAX, it supports almost all features of Microsoft Outlook, it allows you to drag an email and move it to any folder, it allows you to add calendar events, contacts and what not…

Checkout the demo here.

If you want to download the application and put it on your server / machine then here you go, currently binary downloads are available for RHEL4 and Fedora only