Gmail Hacks

Show Unread Mails at Top
At the search box, type in any of the queries mentioned to show unread mails from the inbox

label:unread in:inbox or
label:unread label:inbox

Date Search using Gmail
In Gmail, making use of correct keywords is important. Lets assume you wish to search for mails delivered to you within a date range ( for eg. mails received between 12th Feb 2007 to 10th March 2007). The search query required to be typed in the search box should in this case should be

after:07/02/12 before:07/03/10.

Finding mails with Attachments
Lets now assume that you wish to search for mails with attachments from a particular user ( lets say Hari), then, type in the following in searchbox

from:ABC has:attachment

You can even club a few more keywords. For example, if you wish to search for all the mails in Inbox from Hari which have an attachment and were received between 12th Feb 2007 to 10th March 2007, the following search query should help

in:inbox from:ABC has:attachment after:07/02/12 before:07/03/10.

For your help on these keywords, Google also has a detailed table listing all the keywords. This can be obtained by clicking here