BPOS- Microsoft Online Services on an XP Windows Media Edition Computer

I'm using Microsoft Online Services for my hosted Exchange. It's working great except that the Microsoft Online Services Client doesn't work on it. It installs and tries to to sign in but I get and error that says "There was an error while preparing your application dashboard. Please try again later."

I talked with Microsoft's support and they said that the client is not supported on XP Media Center Edition.

This is a drag because I can't even upgrade the machine to XP Pro because technically it's a downgrade. I had this problem a while ago with getting one of these computers on a domain and was able to change a registry key to get it to network properly. Is there a workaround for this particular problem?