Not entirely. We use some PostgreSQL-specific things, especially the stored procedures.
2. It works with any ODBC dtaa source?
I don't know. I guess you could find that out. I know PostgreSQL has an ODBC driver.
3. Is there a MS SQL ODBC driver for AOLServer for Win32 environment?
MS SQL ODBC? You mean just ODBC right? I think there is. But I can't find it in the AOLserver site anymore. Anybody knows what happenned to it?
BTW, OpenACS will work just fine on NT. Just install AOLserver and PostgreSQL and you're in game. Now if you absolutely need MS SQL server, than that's another story.