I have a Zimbra server running on version 6.0.14.

Currently users have there own calendars that they share with one another but they would like to have one common calendar that could be shared between all users without having to share calendars with every other user.

Is it possible to create a common calendar that would share all the information from all users ? There are approx 20 users that I would like to share their calendar with a common calendar and then subscribe to this single calendar to see all the other users calendars. Is this possible ?

What procedure do I follow to set this up ?