Great Product! What I would love to see is a method of saving your calendar views. That is, lets say an admin person manages several calendars, it would be nice to have saved views that allow you to change which calendars are visible and not, as well as what view it should be displayed in.
The interface can work similar to that of tags and searches where you have a new section in the left pane beneath your calendars, and a new button above your calendar view that reads "save view". Then configure the view you want, which calendars you want visible, and click "save view" and it asks for a name and then lists that name under your calendars.
In future you can only click on the view to have Zimbra return to that view, eg. "Sales View", "My Personal View", "Managers" etc...
What do you think?