I'm a Gmail user for about 3 years now and pretty much happy with it and its ease of use. My inbox was showing a lot of unread mails and i thought of getting rid of some.

So i need to find out all the unread mails in my account and was searching for a option in the UI to do that. Obviously we'll look for some menu, link or a button to do it and couldn't find any such option. After playing with the interface for a while i figured it out.

Just type label:unread in the search box in the top and click search mail. Gmail happily shows all the unread mails.