#!/bin/sh

MAIL_DIR=$HOME/mail
ARCHIVE_DIR=$HOME/mail/archive

for i in $ARCHIVE_DIR/*; do
  MBOX=$(basename $i)
  OUT="$i/`date +%Y-%m`.mbox"; 

  touch $OUT;
  echo ln -sf $OUT $MAIL_DIR/$MBOX;
  ln -sf $OUT $MAIL_DIR/$MBOX;
done