Sometimes there are folders that you see while you are in webmail that don’t show up in WAM when you go to download messages. These “special folders” are for specific uses such as Drafts, Archive, Sent, Important (other custom names). They are usually created by your email provider and often can’t be deleted. They are different than the folders you can create, delete, and move around.
WAM should still be able to see these “special folders”, but occasionally the email provider will make them “invisible” when communicating to their server. If you’d like to download messages in any special folders that you don’t see, just create new folders in webmail. You can then transfer the messages to the new folder. WAM will be able to see this new folder.