Automatically Delete and Purge Deleted Items with 1 click.
Right now in Office 365 to purge a deleted item (to make unrecoverable), it is a 3 step manual process. Each user must delete an item (1), then right click and "empty the deleted items folder" (2), the user then has to go into the recoverable items folder and "purge selected items" in the recoverable items folder (3).
You can set an In-Place archive rule using MRM but, the minimum amount you can set to purge deleted items with a retention tag is 1 day. (The system does not allow a value of 0 days)
Outlook also has a feature that when you close Outlook it will empty your deleted items folder.
There is a powershell command that wipes entire mailbox data without killing the mailbox. But, there is not a way to refine this command to certain folders or to carry across all users by an admin.
Search-Mailbox -Identity "identity" -DeleteContent -force
Search-mailbox -identity "identity" -SearchDumpsterOnly -DeleteContent
There are also powershell commands I have tried to tweak the mailbox settings but, don't appear to work if set to 0 or provide the functionality we are looking for:
Set-Mailbox identity -RetainDeletedItemsFor 0
Set-Mailbox identity -SingleItemRecoveryEnabled $false
The features above almost seem to work but, they do not fulfill requirement if every user in a company is required by contract to purge an item immediately due to the sensitivity of the customer data. It also, does not help admins if this policy is to be enforced across all users in a company. There is no way to tell if every user has remembered to follow the delete and purge steps above to wipe data, leading to sensitive customer data being retained inadvertently on a system.