This tab will only be visible to the system's administrator.
The Rebuild Contacts link has the sole purpose of synchronizing data between the database and the LDAP service. If a new user is created in IPBrick and it doesn't appear at this interface, the Rebuild Contacts enables that any new changes done at the LDAP is now replicated here.
The Import button enables you to choose a .CSV file containing all the entities you wish to add to IPBrick Contacts.