JBoss.orgCommunity Documentation
By default, there are 3 Address Book categories:
Personal contains contacts/address books which are created by yourself. Each group may contain more than one contact.
My Contacts is the default group which contains your own default contact generated from your registration information.
Collected Addresses contains all contacts with information updated automatically when you send any message to a new email address from the Mail, Address Book and Calendar applications. That is, when you send an email to a new address, this address will be automatically added to Collected Addresses.
Shared contains contacts/address books which have been shared with you by another users. You can view and update the shared contacts if you are granted the Edit permission.
Public Groups contains address books of groups to which you belong. Each group contains all default contacts of group members that can be viewed only.