Not sure about this one but could it be that you're replying to Plain Text
email items which wouldn't by nature carry your graphic signtature?

"Deon" wrote in message
40.158...
Hi there,
Outlook 2003

I have created my own html signature file which includes one graphic, text
and a included style sheet. This is saved under signatures.

When I write new e-mails, everything is OK. BUT, when I reply to a mail
message or forward it, the image as well as the effect of the style sheet
are missing.
I have chosen this signature for new mail, as well as the ones I reply to
and forward.

How can I fix this?