Thanks Ewilen.
While command line is more flexible and powerful, to expect layman such as
general end-users and customers to learn them is just not realistic. Zimbra
should have a GUI such as check boxes or options for these to make it
user-friendly enough for the mass just like (or even better) Microsoft outlook
to encourage them to switch over.
Please vote for this at:
Bug 60405 – GUI to view/show only unread emails