An employee created a Google Calendar (Google Apps Premier edition) and has now left.

I, as admin, now want to get control over that calendar, but I can't even locate that calendar on my dashboard.

If I go to another employee/user who was initially shared/invited to that calendar, they see it. However, none actually have admin/manage on that calendar.

* How do I gain control over that calendar?
* How can I control *all* calendars on my domain?