Email
Email Tagging, Conversation Views, Fast Search and Zimlets make email manageable again.
Calendars & Collaboration
Group scheduling and free-busy times, easily share files, documents, folders, calendars, contacts
Desktop Sync
Use any email client like Microsoft Outlook, Thunderbird or maximize productivity with Zimbra Desktop
Mobile Sync
Over-the-air sync to iPhone, BlackBerry smartphone and use iPhoneMail with any mobile web browser.