Groups are named collections of users. Each group has an LDAP entry, similar to a user or resource entry. You can use the same group entry for all services, such as calendar and messaging.
The following are a few facts about Calendar Server LDAP groups:
Calendar Server groups can be either static or dynamic.
Groups with calendar service can have their own default calendar.
Calendar Server groups can consist of individuals, resources, and other groups (nested).
For more information about group calendars, see the following section: 1.5.7 Group Calendars Overview for Calendar Server Version 6.3.