I was part of the pre-beta (alpha?) Windows NT testing program. IIRC it was 1990 when I was invited into the program. NT 3.1 was released in 1993. I can say that Microsoft had very stringent rules on accessing their network. When connecting, a system was checked to make sure that it was up to date including the last virus scan. If the system was stale it was quarantined and updates and scans were offered. One could fix the issues on the spot or disconnect, update the system before connecting again.

An interesting tidbit. Most autos run on Microsoft or Apple software. My BMW runs Windows. One can even do a three finger salute to reboot the vehicle's OS.