>>Can you please remove useless "Notification of comments..." icon from the Message area toolbar.
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>I also do not like it as it's out of the messages area. But, how would a user know if a new comment has been done to one of its replies? Or, maybe we could simply send the notice by email once that happens. This also confuses new members and I was trying to get rid of that from here. Maybe the email would do. What do you think?

I like the e-mail notice option. You could also make this a configurable option for the contributor to turn the e-mail notification off or on.