Guys, Microsoft has a free server for a Windows box, SQL Server 2008 Express. There's a PHP driver for it and it runs XML, 4GB DB size. Some training is also available online from them.
See Microsoft Web Platform Installer.
Has anybody tried it yet? I installed it and I really like the toolset, storage, etc. But sometimes when I bring it up people have this automatic "bleah! MS!" reaction. I have to drag them into my office and show them. So just wondering if anyone else is using it.