I always try to maintain that there is not a single unread email in my Gmail Inbox. One fine day I realized a lot of important mails from a particular sender have gone into spam since past ten days, I immediately moved about forty messages from Spam to Inbox and started reading them, at the end of the activity two mails were left unread which were nowhere to be found. This is when came the need to view only unread messages.
“Unread” is an attribute that messages in Gmail attach like a label which means they are searchable by pointing the label. So all you need to do is go to search box by either clicking or typing “/” and then type “is:unread” and click the search button… all exclusive of quotation marks.