The Microsoft Application Compatibility Toolkit (ACT) version 5.5 contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Windows 7, Windows Vista®, a Windows Update, or a new version of Windows® Internet Explorer® in your environment.
The Internet Explorer Compatibility Test Tool (IECTT):
Is part of the Application Compatibility Toolkit (ACT), helps identify application and website compatibility issues on Internet Explorer 8 and Internet Explorer 7. The IECTT identifies your web-based issues, uploads the data to the ACT Log Processing Service, and shows your results in real time. These tools help customers lower their costs for application compatibility testing, prioritize their applications, and deploy Internet Explorer more quickly.