Folks may remember the support gap when Microsoft dropped support for Windows NT4 Workstation, but still supported NT4 Server.
The difference between NT4 Workstation and Server was minimal, a couple of files and registry keys was all the difference was.
Because Microsoft still supported NT4 Server, we thought,
Ah Ha! We just use the NT4 Server fixes.
Oh, you could still obtain NT4 Workstation patches. IF you had an Extended Support Contract AND paid per patch. We had a small number of customers who did.
Most did not.