Are you looking for a best alternative for Microsoft Exchange server? Then Zarafa is the one you should try. Zarafa, previously known as Connectux, is a groupware application that provides an integration with your existing email server and Microsoft Outlook Access via a propriety client-side plugin. Zarafa offers its own Ajax based email clients called Webaccess and a HTML5 based Webapp, both mail clients has the same look and feel of Microsoft Outlook and we can keep using the features in Outlook. Seems cool, isn’t it?