Microsoft ceased such support for the MSJVM on December 31, 2007 (later Oracle bought Sun, and with it Java and its trademarks).
The inclusion of callbacks and delegates for event handling further defined J++ as a completely different language merely based on an already existing design concept.
However, these extensions (implemented by TransVirtual under Microsoft funding) were not widely used, and J++ applications still needed to be compiled on Visual J++ before being able to be run by Kaffe.
WFC was primarily designed for creating graphical user interfaces for Java applications on Windows.
Some observers have remarked that this incompatibility appears to have been a deliberate aim of Microsoft's, in an attempt to at least slow the advance of Sun's Java technology.
Visual J++ was also the name of the Integrated Development Environment (IDE) for J++ and provided many tools and utilities to help J++ programmers fully leverage the Win32 API.
Visual J# (pronounced "Jay Sharp") is a Microsoft language whose syntax is close to Java, part of the .NET Framework.