Not really answering your question, but...
At my company I configured PHP4 on NT4 (server) and it talks to MS SQL Server 2000 using ODBC. It was fairly easy, I just installed the client software on the server 2000 disk onto the NT4 webserver (Win32 Apache 1.3.14). The ODBC drivers work really well, very quick - also, the PHP ODBC functions are not too bad either.
Chris