Here’s a simple tip for those of you who need to see all the unread e-mails and mark them read. (like old e-mails)
Simply do a search for “label:unread” in your searchbox in Gmail.
Then select all then go to More Actions->Mark as read.
These unread messages might be annoying especially if you have couple hundred of these, it might be hard for you to filter actual new mail. But do this every once in awhile and you won’t have those problems.