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.