When I forward a message or reply to a message in Gmail, the Gmail inbox does not show these messages as forwarded or replied to. There is no indicator at all, so I can't tell if I have already forwarded or replied to a certain message, which is very important for me, especially when I need to handle with many business emails on a daily basis.What I want to have, is the same indicator / marker for forwarded and replied to messages as the one in Outlook:The only feature in Gmail which is somewhat close to what I'm trying to achieve, is the conversation counter, which doesn't necessarily indicate I have replied to a message:I know the conversation view can be disabled, however it wouldn't solve my problem; while it will split conversations to single messages, I will still have to label every message I have forwarded or replied to, and since every message is on its own, I wouldn't be able to set a filter to detect messages I have replied to (which is possible in conversation view).I have found this Google Groups discussion regarding the lack of this feature in Gmail. However, there is no solution for this problem at the moment, and it doesn't look like a similar feature will be added to Gmail anytime soon.Any ideas on what can be done to achieve something similar to what I'm looking for? 
How to mark / tag / label forwarded and replied to messages in Gmail?
gmail;gmail labels