You can customize the order in which your mail appear in your mail box and also you can disable or enable message preview. You can customize the layout from Layout option under the Mail options in left pane along the following lines:
The order in which the messages appear in your Inbox.
The order in which the attributes of the messages appear in your Inbox.
Disable or enable message preview.
To set the order in which the messages appear, perform the following steps:
Select one of the following options under the Message List Default Order section.
The following options are available:
Most recent first: Click the radio button corresponding to this option to list your most recent messages first. This option is selected by default.
Most recent last: Click the radio button corresponding to this option to list your most recent messages last.
Click Save Preferences.
To customize the way the columns appear in your Inbox, perform the following steps:
Change the order in which you want to display the columns by selecting a the column name from the Column Name list.
Click Move up or Move Down to change the ordering.
The column on the top of this list will appear at the left in the Inbox.
Click Save Preferences.
To disable or enable the message preview perform the following steps:
Select the Disable Message Preview check box to disable the message preview or deselect the check box to enable message preview.
Click Save Preferences.