National Instruments is actually one of the few companies that IS still supporting Visual Basic 6.0. We currently offer both an evaluation for Visual Studio 6.0 and Visual Studio .NET. From the Measurement Studio home page (ni.com/mstudio), you will see two different path options: 6.0 & .NET. If you select the 6.0 option and scroll down, you will see the option to request the 6.0 evaluation software here: (https://sine.ni.com/apps/we/nigb.guestbook?code=GB_EVALMSSTUDIO6〈=US&gb_prof_id=1907&scode=&pr=1907).
To purchase the 6.0 tools, you simply need to purchase Measurement Studio 7.0 which includes the 6.0 tools as outlined in the package comparison chart here: http://volt.ni.com/niwc/common.jsp?page=mstudio_package_compare&node=3769
The Measurement Stud
io 7.0 packages (Professional and Enterprise) include both the Visual Studio .NET and Visual Studio 6.0 tools.
Please feel free to contact me if you have any further questions.