The below can be used within any folder in Outlook, including PST file folders.
- Selecting one or more emails
- Hit the Delete key
NOTE: These emails will still contribute to mailbox size until you Empty Deleted Items
It is possible to permanently delete items by using SHIFT + DELETE. Outlook will request confirmation that you want to permanently delete the selected item(s).
NOTE: Once confirmed there is no way to retrieve these items.
Or for additional tips and tricks on deleting emails and folders see the manually deleting unwanted emails/folder page.