Microsoft's Managed Extensibility Framework is an open source (MS-PL) .NET application composition framework available on CodePlex. MEF provides aspects of a plug-in model and an inversion of control container. Code Preview 4 includes performance and diagnostic improvements.
Though released nearly a decade ago, Visual Basic 6 still remains a cornerstone for the IT department of many companies. With so many line of business applications, many no longer with source code, in use, upgrade paths to Windows Vista and Server 2008 needs to be considered carefully. The make the upgrade somewhat easier, Microsoft has committed to an "It Just Works" policy for VB 6 applications.
