If you are tired to unread individual mail(you can only unread 50 mail at a time) in Gmail account but using this you can unread all the mail at one click, this method helpful to you.
To mark all mail as read:-
- In the search box, type "is:unread"
- In the select area press "All"
- A link will appear that says "Select all conversations that match this search", press it
- From the drop down, select "Mark All as Read".
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