I tried running deletion policy for delete immediately for one user only. It presently is priority #2. It didin't delete the older emails that were older than 365 days.
I am including print screens of mailbox policy and advanced for username selection.
I had closed the question cause I thought it by following the kb article I would be all set, but it didn't run successfully.
Also when I am sure that user 46-spare emails are deleted sucessfully by policy, then I want to run it for all users. What criteria do I use, If i leave it blank then I assume it will run for all mailbox users