Notes on opponents in the PS

I have a question: does Poker Stars delete our notes and player rating when we update the software or log in on other machines?

I wouldnt think so. You are using your username no matter where you play from.

No the notes are still there

I've had to save and move my notes many times, but I think it has only ever been needed when uninstalling and reinstalling the client software. It may be necessary when logging in from a different device, but I've not had a new device for several years.