Each user can have multiple phones in the built in phone book. Option to password Protect the whole calendar. (No one can view anything without a login.) Add event categories. Relate users to categories. Make events public or private. If an event is private then only users that are in the related category can see the event. Jump to any date when adding an event CF Server 4.5 and up. Uses access db, can be ported to other dbs. And many more features.