Although the Recoverable Items folder will be hidden from you, mail items can be retrieved by contacting your area’s email administrator. They are transferred to the Recoverable Items folder after one year, or if you delete them from the Deleted Items folder. This folder will appear in your folder list, and you may move objects in and out of it as needed. Items in that folder remain in that folder for a year (365 days) after they are deleted. In-Office 365, when you delete an item from your inbox, it goes to the Deleted Items folder. The message is then delivered to a personal recycle bin or mailed items when we delete or send a message from a shared mailbox account. When we use Microsoft Outlook with a personal mailbox and an auto-mapped shared mailbox, for example, this behavior is usual. Most of us who have utilized Shared Mailbox in a Microsoft Exchange environment have encountered users who have complained that emails sent using the shared inbox account end up in their Sent Items personal mailbox. The settings defined in the user settings area of the registry are overridden by Group Policy registry values. If this registry value has no impact, an administrator may have used a Group Policy setting to apply the adjustment. You can use this to edit the preference for Office 365 and allow for Mailbox deleted items to go into a dedicated deleted items folder as opposed to the personal user mailbox recycle bin.
The registry allows you to manage and control a more complex array of different commands to help manage your applications, operating system, and your general preference and aesthetics. (4 = Stores deleted items in the mailbox owner’s folder.)
HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\Options\General