[otrs] MSSQL

What's the preferred method for getting an install going with an MS SQL server? I've been going off a few different sources but nothing that looks official, so what actually works? The problem I'm running in to now is that I've run the scripts on the SQL server to setup the database and have changed the Config.pm file to point to the ms sql server (i've verified the connection works with isql). But, when I try to log in, I'm getting a "Software error: Can't call method "fetchrow_array" on an undefined value at /opt/otrs/bin/cgi-bin/../../Kernel/System/DB.pm line 624." Thanks, -- Chad