Users are registered in the directory and a mailin database with the name mailin - user name is registered for each user, which refers to the same mail database. If you now create a group calendar with all users, the name of the mailin database is displayed instead of the user.
Example: Mark Twain has a mail database with the name mail/mtwain.nsf and a mailin database definition exists with the name Mailin Twain and points to mail/mtwain.nsf, then the user is displayed in the group calendar with Mailin Twain instead of Mark Twain. Any idea?