So I have a rather ageing edir with a slightly troubled past but that's still running strong today that has a lot of older schemas still in it. (It's been running since 1997)
I've seen things related to Zenworks 3 t/m 7 have been in there), GroupWise, Bordermanager and probably a bunch more from things I have no knowledge about.

Basically the first question is would it be worth it to try and clean up those old classes.
If so, is there a handy way to find unused/outdated ones or to check where a specific one is used still ?
Any other red flags that might come up ?

I've never done this before so I'm being a bit cautious.