Nokia Mail powered by Yahoo - Using Nokia Mail on my N900 device, why do I see many extra folders that were not there before?

If this happens you will need to remove your mailbox (go to Settings, select Nokia Mail, and then select Options and Remove mailbox) and then re-create your mailbox (go to Settings, select Add mailbox, and then select Nokia Mail and sign back into Nokia Mail). Don’t worry, this process does not delete your emails, it just resets your mailbox.