This document provides a feature list comparison for Zimbra Collaboration Suite 6.0 in its Open Source, Network Standard, and Network Professional editions. It outlines features across web collaboration, productivity, mail, calendar, tasks, documents, and more. Key features include an AJAX web interface, drag and drop functionality, spell check, sharing of content within and outside organizations, and conversation view for email threading across folders. Some features like banner ads and customization options require separate pricing.