Business blogging solutions for Six Apart

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1) So, I've got a ticket here at work for:
"i want to get the ball rolling on this... as time allows i really want
to work on creating a full-featured intranet and part of that is
bringing the message board in-house so that it's more useful to people.
it's not really my concern what software we use or how or where it's
installed, but here are some ideas for features that the board should
include (aside from the obvious):

- integration with current and future admin authentication mechanisms -
so that we don't make people log into both admin and the message board
separately.

- ability to request e-mail notification of board updates - by thread,
topic, board, etc.

- customizable look-and-feel.

and so on and so forth. it would also be great if we could query the
board externally so that on a person's admin/intranet entry page we
could list recently updated threads, new topics, etc."

What should I be looking at?