[url=http://forums.b2evolution.net/viewtopic.php?t=1521&highlight=mssql]This thread[/url] suggests that it's possible, but requires some modifications to one of the files. It doesn't give instructions, though. I think you would be better off to just install MySQL. It is free, after all.

ok, that makes sense, but I already have SQL server and due to performace etc that is (off course) preferred compared to MySQL. I still haven't found how to do this - I would assume that someone at B2 would know if this is possible or not.

Any ideas?