Would something like $29.95 (individual developer license) be too much in your opinion? Some corporate developers might not even take it seriously at that price, while for others anything more than free would be too expensive. I exchanged ideas about the possible pricing. A small price would still give customers technical support and updates, i.e. if new functions emerge, they would likely be added to the library, etc. Legacy Extender is not as vast as KernelEx. It focuses on what Visual Studio adds or breaks that the developer did not want in the first place. If the developer used some other XP-only functions on purpose, Legacy Extender will not help much. On the other hand, Legacy Extender is great if you already have a "legacy" project, and simply want to update the compiler, and you thought the only way was to run two different versions of Visual Studio. I doubt that Microsoft would be interested (as a customer), because they have demonstrated that they do not care about legacy compatibility. To the contrary, it seemed to me that they introduced or at least supported incompatibility on purpose. Do you remember how Visual Studio 2005 became incompatible with Windows 95? At the time it did not really break much. It would not have taken more than a few hours of work for Microsoft to retain compatibility by just not using certain functions. Lots of programmers had proposed solutions, patches, etc. I proposed one to Microsoft myself after I filed a bug report (I thought it was a bug!), they filed the "bug" as something like "by design" and closed the case! As for whether it works or not, it's currently being tested in public. Anyone can access it. You are free to decide for yourself, provide feedback, etc. Just my two cents! yes