Interestingly, I believe this is roughly the same size (in LOC) as Eclipse (counting the entire release train), give or take a few million. I don't have any sp

Interestingly, I believe this is roughly the same size (in LOC) as Eclipse (counting the entire release train), give or take a few million. I don't have any specific knowledge about VS, but most giant software projects (including Eclipse) with LOC counts in the millions don't exist as singular projects - rather, they are made up of lots of smaller, loosely coupled projects with generally well-defined integration points. It certainly isn't easy - defining those APIs in a way that their surface area is the correct size is insanely difficult - but it does make managing projects of this size at least manageable.