This is strictly for application developers. The Microsoft Application Compatibility Toolkit (ACT) 5.5 from Microsoft is a freeware which lets you test your application for compatibility issues on any deployment environment, specially if you are developing a new application as it should be compatible with all the changes and fixes released for all windows version. This free software is a good alternative against many cost-incurring services and softwares.

It lets you check your application against a windows version, a windows update or any internet explorer security fix.

It is specially of importance when you are developing a new application as compatibility with Windows 7 is of prime importance in the current scenario.

Else than the basic requirements for Visual Studio, the software specifically requires .NET framework 2.0.

For further details and download, go to the software homepage at : Microsoft Application Compatibility Toolkit (ACT) 5.5 Homepage