[Zope] calendar

I'd like to have a company-wide calendar thing, like the one that Outlook and Exchange gives you. Free times, meetings, recurring events, such things. I think that maybe cmf does something like that, but whenever I try to access cmf.zope.org/calendar/calendar I get a page with DTML exception inspector. I don't have cmf installed now, but if you say so I will install it. Or you can recommend some other product. Regards Gee