It's not a direct line, but you'll get to the admin secretary closest to Steve Ballmer. If you have a longstanding Microsoft issue that multiple trips to the MS customer service line haven't solved, try pitching her your problems. Microsoft Steve Ballmer
J. Lee, M. Wu, C. Liu, und Y. Chuang. Proceedings of the 2nd International Conference on Biomedical Signal and Image Processing, Seite 13-17. New York, NY, USA, Association for Computing Machinery (ACM), (2017)