Outlook 2003: how to forward messages and not lose the sender/recipient email addresses

This is also not the smoothest answer, but you can open up the email, and click on the Options... button (or if it's not added to your toolbar, it's menu item View->Options...). You then can see the full internet headers, including all the full email addresses. Copy and paste whatever portion of that text you want into your reply.

Not elegant, but works.

I don't know if this is an option in Outlook 2003, but in 2007 you can use Actions -> Forward as Attachment to forward the original email with all header information intact.

It's a little less convenient for the recipient though, as they now have a .msg file to open instead of reading the forwarded email inline with your message.

Apparently this is not possible.

Refer to this

There is no way to change that. Internal addresses simply do not show as (in general) they are not needed as addressing the email by name would suffice since Exchange resolves them.

External addresses will show and do get printed. If an email gets forwarded, the external email address is also placed above the quoted text. Are you saying that this isn't the case for you?

If the person forwarding the message to you was internal for the original sender and they were using Exchange, then the original addresses wouldn't get quoted either of course.

If the order is generated by a form, you could opt to have the email address also be added to the message body.