>Can a non-premier member retrieve stuff from folders, or only save to them? I could find nothing about that in interface help. Eventually, I will get a premier membership, but I wanted to try it a while first. Also, is there a way to retrieve older messages, or is that only for premier members?

Definition of folders is accepted but can't save messages in them without PUTM.

As for older messages, it depend what you need. Search is PUTM, previous login in general, recent messages is PUTM, folders saved messages is PUTM, etc.