At work we run YaBB as a discussion board for our technical support staff. The original plan was to use a News server, and a newsreader, but IT didn't want staff using any extra software, so we install YaBB on our Linux/Apache servers, and let them access via a web browser.
It's proved quite popular, but there is a problem, the users can't remember their username/passwords. For some time there was an unreported SMTP fault that was recently corrected that may have caused some password reminder problems. Basically IT want a product that support M$ Active Directory, so the users don't need to logon explicitly to the discussion forum.
A quick search with Google didn't turn up anything helpful. I need to find a way of patching YaBB to support AD, or find a discussion board software package with AD support. I don't do NT/IIS, and all I know about AD, is that it's a broken/proprietary version of LDAP.