Previously, when resending a message, I could add a separator line between my original message and new text by typing a series of underscore characters. When I hit the Enter key, the underscore characters turned into a solid line extending across the width of the message.

I just installed Outlook 2003 SP3 onto a new workstation and I can't seem to create the continuous line anymore. When I type several underscores & hit Enter, they remain just a series of underscore characters. Is there a setting where I can change this to behave the way it used to?