How to get rid of a phantom voice mailbox? Somehow I wound up creating a Distribution List Mailbox without any distributee extensions instead of a Subscriber mailbox. The DLM doesn't show up in any of the menus, so I can't delete it. It does show up in the Archive and Restore processes. When I try to create a proper subscriber mailbox under the same extension number, it tells me that a DLM already exists for that extension number.