1of3Dan'l Lewin poses for for a portrait at Microsoft's Silicon Valley campus on Tuesday, June 24, 2008 in Mountain View, Calif. Photo by Mike Kepka / The ChronicleMike Kepka/The ChroncleShow MoreShow Less Dan'l Lewin's chief task when he joined Microsoft seven years ago was to improve relations between the software giant and Silicon Valley. The Redmond, Wash., company had just introduced new tech