They already had the most widely adopted platform in Win32. The transition to .NET was horrible. No one was sure what .NET actually meant for a while, as it was used in marketing for all kinds of things. They also seemed to change their minds every few months about how which platform people should use. Finally it converged, and .NET is not bad. But they already owned the desktop app OS and dev platform since the mid 90s, when they overtook Borland and others.
All I know is that for a sample of 1, me, I used to use (and really like) the Borland (Pascal, C, ...) compilers in the late 80s and early 90s. Then, I started doing more unix and then Linux work. GCC, perl and later Java was there. By the time Delphi was there, it was too late - Java had already provided a free equivalent. (Java is just Modula + OOP + UCSD-P-code in C++ clothing)