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I can't find a generalised "What the heck are namespaces all about?" anywhere, can anyone point me to a decent one? More directly, my question is this: if I set up two non-hidden private namespaces (one for mbox and one for maildir), will a well-written IMAP client automagically list folders from both as if they were part of (or below) the same hierarchy, or do I have to set up two