It actually was my main mining rig for years even after Win 10 was released. It was much more stable than Win7 and for ETH mining it was more stable that Ubuntu hence I used it on some of my rigs.
I stopped using it primarily because there are no more security updates. It was discoutuined sometime in Jan 2020. Hence with all the exploits out there, there is no point in using it anymore really. Hence had to upgrade those rigs to Win 10. Sure miss Windows XP and Windows 7.
There should still be a few ways to lock it down, but it may not be worth the risk.