i completely agree with Smtips. this is a horrible app. i do not get all the raving. it has been broken since v2.x when yahoo! bought out zimbra. had hopes when vmware in turn bought it from yahoo!, but other than improving the gui, not much has changed.
local mail storage is not fully recognized by the application...it's like a separate and not equal account. cannot be searched, which is pretty much the point of a database email application. saved search queries missing beaucoup messages on the server as well...which is easy to check with the web app version. tags will not migrate between server and local storage, in fact, tags will be removed when moving messages between server and local.
calendar is just plain horrendous. settings and preferences are the most convoluted i've seen in a very long time. must re-position windows and panels on each startup.
it is a constant fight with this app, which is pretty sad for email. email has been around for what now, 40 years? and these guys still can't generate an app that works for basic functionality? v7.x is prettier and faster than v1.x or v2.x ever were, but that's about the only positive thing i can say about it. pretty and fast doesn't matter much when the darn thing can't find 75% of your mail.