"Zimbra calls itself a 'leader in open source messaging and collaboration,' but does it live up to the name? I spent some time evaluating the suite, and while Zimbra isn't perfect, it's a decent collaboration suite that is well worth looking at if you don't already have something in place.
"Zimbra is available in three configurations: an Open Source edition, Network Standard edition, and Network Professional edition. The freebie version is missing several features that you'd want for professional deployment: Outlook synchronization, mobile synchronization, backup features, clustering features, and more..."
