"A good example of a legacy system is a pre-2000 computer running Windows 98."
I thought something pre-Win95 would be legacy... maybe I'm behind the times! Then again, I only found out what "legacy" means from an old video on YouTube promoting Windows 95 when it was the newest thing. The video had Chandler and Rachel from Friends hosting, cos those were the days when Friends was the newest thing too. :-D
A legacy system is a payroll or billing application written in COBOL or FORTRAN running on an IBM 360 mainframe in some datacenter somewhere. Like what processes your AT&T bill, no joke.