Click on the Alternative Text button in the navigation bar above the document display pane, to switch to a rich text view of the message. In this view you can open attachments under their parent application, and/or add the attachment to a database.
OCR would be needed only for image-only (non searchable) PDFs.
Select the document(s) (multiple selections are permitted). Use Data > Convert > to Searchable PDF, or control-click and select the same command from the contextual menu.