From Scalabium Software:
Viewer for MS Outlook Messages supports the viewing of Outlook files, EML messages and MHTML documents. All message formats (HTML, RTF, plain text) supported without the need to have an email client (MS Outlook, Outlook Express, Thunderbird) on the server or client machine. You may read the message with all mail information (subject, body, recipients, attachments, forwarded messages), contact, note, task, appointment, journal, post item. Viewer for MS Outlook allows viewing any email (including forwarded and embedded) as a single window and can save the attachments embedded within mail. You may open, view and save attached files by simply clicking on list of the attachments.