In Messaging section you can store and view e-mail messages from your Symbian OS phone. The very folder(-s) will only be shown in the case it is presented in your phone.
As you can see from the screenshot, there are two E-mail folders for the very phone - My box and My box 2. There are no unread e-mail letters in those folders at the moment, if there are any - that can be seen near by the folder.
See also: