Upgrade from PHPBB

I have a busy PHPBB forum -- I'm running it on IIS, Windows 2K, and SQL Server. It scales badly and has a variety of problems that probably aren't surprising -- I want to switch to a SQL Server (stored procedures, I hope?) ASP forum ...

I know you don't have a PHPBB upgrade script; I'll be happy to write one, if your software supports MD5 hash for storing passwords. Any chance? I'm willing to drag my users to another platform, I'm not willing to make several thousand people re-register.

Yes, the software natively uses MD5 hash for storing passwords. I don't know how exactly PHPBB hashes user's password (we salt the password before computing the hash to prevent disctionary attack), but with a simple modification (a few lines of code in one function) the software can be made compatible with your current user's password format. We have users converting from other packages that use SHA-256 hash for storing passwords.