Mail.box became corrupted with 16K messages. Database was not repairable using fixup or updall. Solution: Using
an R5 server, load compact -i. After compaction, open the database from a R5 client. Quit router on existing R5 server, renamed mail.box to the repaired mail.box, load router and 16K messages flowed through without a problem. Saved users from resending the original 16K messages.