There are two main methods to add or remove columns in Outlook 2010.
Method 1:
1.Click “View Settings” on the View tab < click “Columns” < the “Show Columns dialog box” appears.
2.select the requested column from Columns list < click “add” to add the column or
select the requested column from Columns list < click “remove” to remove the column.
method 2:
1. Open the reuqested folder in Single\Preview view.
2. right click the column header bar <choose “Field Chooser”.
3. Find the name of the field to be added < drag the field from the Field Chooser requested location on column header bar.
4. If you want to remove a field < drag out the field from the column header bar.