Microsoft Application Compatibility Toolkit 5.6 was a game-changer for its time. It taught administrators that they didn't need to accept application failure as a fact of life. It gave us the data to make informed decisions and the tools to hack legacy software into submission.
As of 2024/2025, by Microsoft for modern OSes (Windows 10/11/Server 2019+). Key limitations: microsoft application compatibility toolkit 5.6
Have you used ACT 5.6 in the past? Did you ever create a Shim that saved a critical business application? Let us know in the comments! Microsoft Application Compatibility Toolkit 5