This compact, friendly guide for administrators who want to use Zimbra in small/medium businesses contains plenty of step-by-step instructions as well as useful references and checklists. 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. The Zimbra Web 2.0 Ajax client runs on Firefox, Safari, and IE, and features easy integration/mash-ups of web portals, business applications, and VoIP using web services. This book covers installing and configuring Zimbra for use with the web client, Outlook, and mobile devices; Zimbra Collaboration Suite architecture and Administration; setting up users; using Zimbra as your main email server; security, spam, and virus issues; configuring Windows Mobile and PalmOS to sync with Zimbra; Zimlets (Zimbra mash-ups); backing up and managing performance.