This how-to video series is focused on features and functionality found in the Application Compatability Toolkit. Microsoft continues to enhance the overall security and reliability of the Windows® operating system. These changes are the result of many different considerations, including feedback from developers, users in the community, and support engineers at Microsoft, as well as the overall strategic roadmap of the Windows product. Ultimately these changes culminate in new features being introduced into the Windows operating system while some legacy features are improved or retired. Many applications use a diverse set of operating system functionalities, so it’s often difficult to broadly predict how applications in your environment will be affected by a change to Windows. The goal of this document is to help you understand the impact of application compatibility on your environment and how you can address application compatibility concerns.