Smart Folders are a virtual set of folders that unify all your setup accounts for your convenience. The Smart folders include All Inboxes, Outbox, Sent, Drafts, Junk Email, Unread, or Flagged folders. They also include Category folders, which will show all messages with the same assigned category and Search folders which will show message based on specified search parameters.

You can right-click the Smart folders to select which folders will be displayed and which will be hidden.

Smart folders will be shown above your other account folders in the left-side folder list. This feature allows you to check all emails without having to go through each separate account individually.

Smart folders should appear automatically if you set up two or more accounts. If you do not see Smart Folders, you can enable them in Menu >Tools > Settings > General > General and check the 'Show Smart Folders' option.