You can The 'viewing 'drop-down box allows you to customize the way the individual emails and the mailbox folders are displayed. You have the option of seeing each mail either in a new window or the same window itself.
Click the 'Viewing' drop-down box to see all the options available. Each of the option in the drop-down box allows you to see the emails in different setups. The options are as follow:
'View Messages and mailbox in separate frames': Select this option if you want to see the individual messages and the mailbox in the same pages but under two different sections (i.e. in separate frames on the same page). When you select this option the mailbox is seen on the top frame of the 'My Email' page and the contents of the message is displayed in the bottom frame of the page.
'Use the same frame for both messages and mailboxes': In case this option is selected the message you wish to read is displayed on a new page. When you go to the 'My Email' page under the personal section in the navigation bar, the default view shows you all the emails you have received. If you click on the email under the 'Inbox' section you are taken to an entirely new page, which displays the contents of the email you have selected. Click the 'Back' button at the top right hand side to go back to the mailbox view.
'View Messages in a new window': Select this option in case you wish to see the mailbox and the individual messages in two different windows. So if you click on any message in the 'My email' page, a new window pops up displaying the contents of the message.