- In Outlook click on the Inbox of the account you wish to perform the subscriptions on. (image)
- Click on "Tools" and then click "IMAP Folders..." (image)
- Click the "Query" button to get a list of available folders. (image)
- Click on the folder you want to subscribe to (i.e. spam) and click "Subscribe". (image)
- Click "Ok" when you are done choosing your folders.