Our company has a lot of legacy VBA code that would need to be replaced. Don't get me wrong, I think it would be smart to replace this. I hated the way VBA changed on every release and broke my code base. The last straw was when I needed to access spreadsheets that used 3rd party VBA modules that were locked. I ported my whole back-end data analysis/report generation code base to Open Source R/Sweave/LaTeX. But I'm just one user and did it myself as a spare time activity.
I still think Visual Studio is a pretty nice development environment for C++. I'm trying to get up to speed with Eclipse. I do prefer Open Source. Now that our corporate budget is REALLY tight, that is a big help. Guess the IT folks think it would cost more to switch than pay the annual tribute to Redmond