Ironically, most modern C++ code I wrote was not for Microsoft, but a much smaller company that is not in any way involved in ISO C++ standardization process. It was due to that company culture - senior engineering leadership (which were also the founders) were all big standard C++ fans, and they wrote much of the original codebase.

Large companies like MS often have codebases that are so ancient (e.g. HRESULTs and IF_ERR_GOTO type macros everywhere), they only get modernized very gradually if at all.