can anyone explain to me in a few steps what needs to be done to use Zimbra as calendar server for Evolution?

The title of this forum is 'Evolution Connector' but is there really a separate connector for Evolution? I didn't come across one.

I have searched the archives and found some hints on how to interconnect Evolution with Zimbra, but they didn't help. I tried CalDav with url webcal://my.zimbraserver.name/service/ical/cal.ics + a username, and that seemed to work, as I was prompted for the password. After providing my password, nothing happened. I didn't see my appointments show up in Evolution, and when I added a meeting in Evolution, I got a 'Unable to open the calender <name>' error message.

Something is still wrong, but what?