How to change or edit default email retention policy on exchange server This policy make deleted mailboxes possibility to connect back for the defined time range 1- Open and login to https://mailserver.com/ecp/ 2- Go to servers,then go to databases 3- Double click on the database that you want to change the retention policy 4- after that go to 'Limits' 5- then change the parameter of *keep deleted mailboxes items for(days), by default it keeps the deleted mailboxes for few days, we have changed to 365 days