File Viewer Plus allows you to view saved email messages, including the Outlook MSG format, Winmail.dat files, and standard EML files. You can also save attachments from these emails by right-clicking the email attachment and selecting Save attachment... If there are multiple attachments, you can click the Save all... button to save all attachments at once.
You can convert your emails to Apple Mail (.EML), Microsoft Outlook (.MSG), or .HTML formats by clicking the Save As... button and choosing your output file.
File Viewer Plus supports printing of email files. Simply select File → Print... to print a formatted document, which includes the email body as well as the From, To, Cc, and Subject fields.