If you are using IMAP to connect to your email account you may only see your inbox folder and no other folders you may have set up in another mail application or webmail. An IMAP folder list can be downloaded to your Outlook 2013 email client so you can subscribe to it.
Step 1 : Open your Outlook 2013 email client
Step 2 : In the left pane, right-click on the Inbox folder for your IMAP account
Step 3 : Click “IMAP Folders”
Step 4 : Click “Query”
Step 5 : Select a folder and then click “Subscribe”. If you want to select multiple folders, press and hold the crtl key as you select multiple folders.
Step 6 : Click OK.