export all calendar event

[vajtsz]

How can I export all user's calendar events ?

I can export one user calendar with
http://hostname/zimbra/user/USERNAME/calendar.xml
to XML format.
I can process the xml file, and sort out the intresting data from the XML file, but how can I list ALL user ALL calendar event ?

Or I should use the mysql database ?

I would like to print a report from the uses of resources...