The early-adopters upgrade program we implemented in Release Candidate 1, as well as those who have joined the network edition support program, have provided great feedback; we assure you there will be no “terrible two’s” for this offline client. Infact the toddler analogy isn’t a very good comparison at all.
We’ve been at this game for a while – tweaking Zimbra sync to include every feature of the online client, adding support for a slew of common hosting providers (that proves great when you don’t have network access for whatever reason), and working directly with the Mozilla team to create some Prism enrichments that have changed the world’s expectation of a standalone web-app. In short, Zimbra Desktop’s maturity is better measured in dog years; and that’s just version 1.0
If you’re just discovering Zimbra Desktop for the first time you can grab the RC2 installer here for Linux, Windows, or Mac.