By default, all your messages are stored in the Inbox. As the amount of messages grows, you may want to organise them according to theme, subject or even sender. To do this, you can create folders as you would anywhere in Windows – that is you can create a folder within another folder, or within a “nest” of folders.
To do this in Outlook Express:

You can also set up Outlook Express to automatically direct certain emails into selected folders. To find out more, click here.