Plone vs. phpBB

I'm wondering if anyone can help.  We're looking to implement a bulletin
board, and were wondering whether anyone had experience of either Plone or
phpBB, and whether anyone can recommend either.

In particular, it would be useful if anyone has any views on the following:

- We need to make the system W3C single A compliant.  Is there anything
specific we need to bear in mind with respect to either product?
- How easy/difficult is either system to maintain?: moderation, upgrade,
configuration etc.
- Is there any out-of-the-box functionality that comes in the area of MIS?

Any help you can provide would be hugely appreciated.  Thanks!

Dan.

Dan Harrison
w: www.osirra.com