I’m frustrated

Why can't I see any of my old folders?

I was prompted to upgrade to 3.1.2 and in the end I can't see any of my old folders. They appear to be there when I looked at the filter settings but they just won't display in the left pane - even when I switched from "Unified" to "All". I noticed there was another similar posting that was solved. I have spent the past few hours trying to follow the steps that answered/solved it but had to start a new topic altogether.

Now I noticed that in the Inbox for the "Unified" each mail message appears multiple times:

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