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Full user review
"As a free e-mail client, half-baked"
Seems to have many features
At least one significant feature that is supposed to work -- called "Incoming Message Filters" -- does not work. You would use this to sort incoming mail by subject, sender, etc. For some, it seems to work on incoming mail, but not for me. But filters cannot be applied retroactively to your inbox -- a very common requirement. The online help says that you can do this, and even provides instructions. Unfortunately, those instructions refer to at least one button that simply does not exist. There is a bugzilla entry on this, and it is marked as fixed. But several people have commented that it is not fixed.
The 'product' just does not seem to be finished, at least in its 'free' version. (I am attempting to use Zimbra Desktop 7.1.4 GA (build 11299), but will soon switch to another client.)