If you receive a steady stream of email during the day, you’ll realize very quickly that leaving all your messages in your Inbox isn’t a very convenient way to organize the ones that you might need later. Outlook makes it simple for you to add mail folders so that you can organize messages by project, by who sent the message, or by using any other organizational structure that makes sense for you.
Click the Folder tab.
In the New group, click New Folder.
The Create New Folder dialog box opens.
Type a name for the new folder.
Select the folder in which you want the new folder created.
Click the Home tab.
Select a message to ...