In late-90s to mid-00, if you did any serious Win32 or .NET development, you had the MSDN Library installed locally - it had its own help browser, with integrated search and index. The latter was especially useful, since it contained
all structs, classes, interfaces, functions etc, across all platforms for which docs were installed.
Anything that was available online, official or not, was inferior to that. I'm not sure if it was deliberate, but it significantly hampered the utility of pirated copies of Visual Studio - since MSDN docs would require a lot more CDs than the software, most warez releases stripped them out. And in the developing world, where such pirated software is readily available on physical CDs sold by street vendors, they would usually be priced per CD regardless of what's on it - so a complete VS+MSDN bundle would be a lot more expensive, and thus in relatively low demand, and not widely sold.