Comment by valarauca1

10 years ago there was less file system integration, user land virus scanning, kernel level virus scanning, os-hooks, OS-compatibility re-direction, and 32/64bit compatibility checks.

This was mostly added during NT6.0 era, which occured ~12 years ago. VISTA was the first OS using NT6.0 and VISTA was VERY much not in vogue ~12 years ago. In fact it was avoided like a plague as of 2008 (unless you were using 64bit, and had >=4GiB of RAM)

So many were using Windows-XP 32bit, or the NT5.2 kernel. Even those with >=4GiB of RAM were on Windows-XP 64bit, as VISTA had a ton of driver problems.

NT6.0 didn't catch until Windows7 and NT6.1