I'm considering installing Wordpress at example.com/blog.  However, example.com functions mainly as a forum/bulletin board, and thus has a user database.  I'd like users of example.com to be able to login to the Wordpress install with their existing credentials.  Is that in any way possible?  This is further complicated by the fact that example.com is written in .NET and uses a Microsoft SQL Server database.
Is it possible for Wordpress to get user information from an existing, non-MySQL database?
wordpress
I haven't tried it but this plugin seems to be what you need: External DB authentication.