Is SQL that much better for a large traffic messageboard?
Is it worth the extra Cash?
OK the more complicated answer is that forums are server intensive, I know a lot of companies (hosting) who passionately hate them, multiple queries running all the time, some quite complex, people writing to the system repeatedly and so on...
Access is pretty good, particularly v2000 (and above) however SQL is better... especially when WRITING / UPDATING information to the forum... So, a popular forum - yes, an unpopular one - no!