@mos_8502 one company I worked for at that time (one of literally the largest banks in the world - a firm that in the 1990’s talked about having $1T in assets under management) used y2k as an excuse to update internally written applications. We started the process with over 1200 internal applications (we had over 1500 full time programmers) this was in 1997/1998
They all had to test and certify their apps and all dependencies.
Unless they signed off that their app wasn’t critical
No takers