Windows Phone SDK 7.1.1 update is a minor upgrade with two primary goals: to make it easier for developers to reach more consumers and bugfixes (>500 bugs fixed). To make Windows Phone devices easier to acquire and distribute, Microsoft has permitted device manufacturers to build lower-cost devices. These devices have only 256 MB of memory and weaker CPUs. They may also have other physical limitations. For example, some devices may not have a camera. Making those devices available is vital to...