2.1.8 was the first version to "officially" support MS SQL. The main problem with MS SQL is that it doesn't support LIMIT and OFFSET SQL directives and these are used a lot by jForum. 2005 has better support for this, so that's why the "official" release uses this.
However, there is a "unofficial" but production ready (e.g. I use it for my sites) alternative for version 2.1.6. This is based on the Torque package (
http://db.apache.org/torque ) and supports MS SQL 7.0, 2000, etc. (FWIW, I'm one of the committers for the Torque project).
Everything that is needed is available from:
http://people.apache.org/~gmonroe/jforum/
See the Readme.html file to get started.
[originally posted on jforum.net by monroe]