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Is it possible to prevent Outlook users from deleting items in their Deleted Items folder?
Sure, though you'd also have to block the ability to recover deleted items at the same time. Essentially, you would need to locate the file called "dumpster.ecf" on all user hard drives in your environment and delete it. This removes the add-in capability to recover deleted items from within Outlook. There is no way to get more granular than this from a permissions perspective.