phpBB nesting?

Hi,

Is it possible to configure phpBB to display threads "newsgroup style"?
What I mean by this is to show replies to the top level post indented
in a tree structure. One thing I cannot stand about phpBB is that all
replies to a top-level topic are in a long train. You never know if
somebody is replying to the person before him or the original poster,
etc. If not, does anybody know another open source forum tool that
does this, besides mwforum?

Thanks,

JM

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