You are correct in your assumption. I have a Dell D820 with Windows 7 Ultimate. I keep it percolating because my Diabetes tracking Software won't run on anything after that. I started with Windows 3.??, I think 12, and I can tell you that Windows 10 is, in my opinion, far superior to all the others. I've also had 95, 98, 2000, Vista and XP. I really enjoy the added features in 10. To me it seems to have the best of all of those other OSes. My second choice would be 2000 and 3rd XP. The least favorite was of course Vista. Gonna have a nap now so won't be replying for awhile.