This is an example module for file system based storage for messages. It uses the file atime vs. mtime to determine whether a messagee is new. This module lacks delete-locking of an open message directory, which means that its possible to delete a message in one call and on a parallel call not be able to listen to that deleted message any more (even if it was in the list before). This should be very rare usage though. If you are looking for efficient, simple, application level replication of message files for all-active shared-nothing n+1 redundancy cluster voicemail and voicebox operation at low cost, don't hesitate to contact iptego GmbH at mailto:email@example.com or have a look at http://www.iptego.com/products/cnsp/ .