"The user computing world is changing. PCs, although still critical components of the computing landscape, are no longer the only devices for delivering services and applications to users. Smartphones and tablets are fulfilling the role of the primary device for an increasing group of users, and most of these devices are from vendors other than Microsoft," said Mr. Kleynhans. "In this environment, Microsoft needs to move to a platform that enables a new type of application, and embraces new types of user experiences. Microsoft is responding to competitive pressures that have made it rethink not only how its products should look, but also how they should be architected for security and manageability."