How you can can customize your Gmail Preview Pane Settings. In this trick you don't have to open a mail and get back to open another mail by this you will be able to see your all inbox messages and a mail side by side. In this your Gmail page will be divided into two parts:-
1). In the First Part there will be all your inbox messages or mails received from your friends.
2). In the Second Part your selected mail will be open.
Here are the steps to Enable Preview Pane:-
1). Login in to your Gmail Account and click on the Mail Settings by selecting the Gear icon at the right side of your profile picture.
2). From your settings click on the Labs button.
3). Scroll down till you find Preview Pane and select enable button and save changes.
4). Now you will see a message, see the screenshot below:-
5). Click on the button to which the arrow is pointing in the above screenshot. It will ask you in which view you want to see your window pane as in the picture we have chosen Vertical Split and this will look like:-
Thats it... :)
