I am looking for a way to change the category of the original message once I have replied to it. For instance, I have two categories, "Reply Needed" and "Waiting for Reply". When a message comes in, it automatically gets the "Needs Reply" via a rule. When I reply to it, I want the original message to automatically switch to "Waiting For Reply" so I don't have to remember to re-categorize it. How is this possible??