Dear DTXM,
Another approach would be to set up an IMAP
server on your HP-UX box. Assuming that Mozilla is able to read your emails (you didn't mention if they come from Netscape or from something else) then you could copy or
move the emails over to the IMAP server using Mozilla. After doing that, you could pick up those messages from the IMAP server using Outlook.
A bit of effort, but that way you could preserve the contents of the emails well, including dates, subject, to, cc, from information and attachments.
Kind regards, Christian
Yeshua loves you!