Hi, I have just joined the group, so forgive me if this problem has been addressed before, I did search the archive with no success. I have a client with a number of HUGE mailboxes, some in excess of 16 Gigs. As you can imagine, the server slows down to a crawl when acessing these mailboxes. I am trying to use the mailutil's prune option to remove messages from one of the 16 Gigs mailboxes, but I get the error message "Can't open mailbox <mailbox_name>: no such mailbox". However, if I perform the same operation against a mailbox which is approx 4 Gigs, it completes successfully. I have done a little debugging and noted that the error message is being generated by the open_mail function within the module mail.c.  Has anyone else attempted this on such a large mailbox file? Is there a limit on the size of mailbox file that can be handled by mailutil? Am I wrong in assuming that the problem is related to the size of the file? Any help/pointers greatly appreciated. -- Carlton