Cannot delete folders

I cannot delete folders that I imported from another email client. The folders are under “Local Folders”. The problem might be that those folders are called…Inbox, Outbox, Sent, Trash, Drafts, Junk Mail. I have since either transferred the contents of those folders to the eM folders or deleted the contents. But even though now empty they cannot be deleted. The solution should be to rename these folders but that is also not allowed. Since deleting and renaming is not allowed then how can I remove them?

Any ideas?

I have this problem too.  It went away for a while, but now it’s back.