, Blue Ink wrote

@Harlequin: there was a similar discussion in the VS 2010 timeframe, and the answer given back then was that the VS team was focusing on making sure that VS dídn't abuse memory enough to make a 64bit version desirable. They seem to be sticking to their self-imposed diet, which is a good thing.

Definitive post at http://blogs.msdn.com/b/ricom/archive/2009/06/10/visual-studio-why-is-there-no-64-bit-version.aspx

Rico was Chief Architect of Visual Studio 2010 before moving to the IE team.