
This is why I keep suggesting that Andy looks at the SMF board - it's got all sorts of goodies built-in (spell checkers etc), it has a well-deserved reputation as being well-coded, and bomb-proof, and I've found it far easier to use (both for the owner of the board, and the guests) than PHPBB.
If he's going to do a migration to it, the move of servers would be an excellent time to do it! - there are some migration scripts available to do the job for you, that way, you could keep this version up and running, overlap it with the other one for a week or three, and try it out - if you decided you didn't like it, you could whack phpbb back in a bit quick! -(but I'm pretty sure you wouldn't want to!)