You may need to find mails older than some specific days like 100 days of 125 days because you may need to delete it as its not possible to delete it from outlook. You can use this command to find the mails older than specified days.

Here I have mentioned command to find mails older than 100 days.

find -P /home/pchmpl/mail/pchmpl.com/*/cur -mtime ‘+100’ | xargs ls -l