I am unable to delete a guest mailbox (not associated with a set) that was a choice option on a CCR tree. I deleted it from the CCR tree after disabling and it appeared to be removed from tree 1. When I attempted to delete the mailbox I got an error message saying the mailbox was part of CCR tree 9. There are only 8 CCR trees available.
When I do a mailbox report, the name is preceded by an asterisk (*).
Any ideas on how to delete this mailbox?