Microsoft has published the specifications for the XAML programming language. This includes XAML, XAML 2009, and the extensions that are specific to Silverlight and WPF. For reasons that are not quite clear, the specifications for the Visual Basic for Applications language is also included.
Imagine you are doing maintenance on an application from the late 90’s that uses the classic ADO libraries. The recompiled code works fine on any Windows 7 SP1 machine, but mysteriously crashes on the Windows XP machines that have been running the program for nearly a decade. This is the problem facing lots of maintenance developers.
Visual Basic for Applications is a dead-end and Visual Studio for Applications isn’t ready for prime time, leaving developers in the uncomfortable position of trying to mix .NET code with legacy VBA macros. Fortunately Visual Studio Tools for Office makes it relatively painless.