At this point, my colleagues and I think there's a strong likelihood that the scoring of the simulation exams is flawed. I expect the problem to be corrected eventually, but I can't help wondering how many people should have passed their exams, but instead received failing scores.
If you're planning in the near future to take a Microsoft exam that includes simulation questions, I encourage you to review all the articles that reference Microsoft simulation exams. Pay particular attention to the comments that follow those articles, because people often share their exam experiences in the comments. In addition, I encourage you to visit the public newsgroups related to certification on the Microsoft web site.
I'll be sure to post updates to this article when I have them. I also hope that other people will add advice and share their recent exam experiences.