I'm running an up-to-date operating system, and I switched to C++ 11 as soon as it became viable. I can do that because I'm an individual. Organizations move more slowly, and the bigger they are, the slower they move.
Not necessarilly, e.g. every Windows OS is built with the (their) latest compiler... that's why they make it in the first place (at least in the past)...
It wouldn't surprise at all to see Visual C++ 6.0 still being used
The fact that this happens doesn't make it anything less than a crime, for which any CTO should be summarilly executed...
Wikipedia even says, "Visual C++ 6.0 is still quite popular".
Don't believe everything they say on WP. The release schedule of gcc is here https://gcc.gnu.org/releases.html. Now have a look and try to figure out why I thought was pretty funny... (hint: the combination of the words "up-to-date" and "gcc 4.8")...