Office 365 offers message retention - our standard configuration will see it set with a seven year period. So you can delete from the outfox, and it goes to del

Office 365 offers message retention - our standard configuration will see it set with a seven year period. So you can delete from the outfox, and it goes to deleted items. If you delete from there it disappears from view, but any admin exporting your mailbox will include it for seven years.