Can customers, developers, ISVs, solution providers, etc. modify the application templates?
A. Yes. This is one of the main goals of the application templates, as a demonstration of the application building power in Windows SharePoint Services and as a potential starting point for larger applications. While the new templates are fully functional and usable out-of-the-box, Microsoft expects that people will tailor them to suit their own needs. And those looking for support on their customizations will find an appropriate channel when contacting Microsoft Customer Service and Support. Simpler modifications such as changing a master page, adding a new view or integrating new lists into the template are well within the scope of existing product support.