We used to have several voice mailboxes that were end nodes of type Mailbox on a CCR tree. These mailboxes were not associated with any extension; each mailbox was supposed to be checked by a staff person periodically for messages. As this was not happening as often as it should have happened, or in some cases ever, we decided to change these nodes to go directly to the appropriate person's own mailbox. After creating a new CCR tree to implement this change, and deleting the old one, we tried to recover these now disused mailboxes so they can be assigned to new staff members. All attempts to delete these mailboxes get the following response: "Mailbox xxx cannot be deleted because it is used by Custom Calling Tree 100". Huh? There are supposed to be only 99 possible CCR trees. How can I get rid of these unwanted mailboxes? What is CCR tree 100? System is BCM 50 at level 2.0.2.05e with voice mail version 42.02.31.22