The 8500 WILL upgrade to Win 10. Check the Web for successes. The major reason Dell will not support many 3 years or so older computers is because the hardware supplies, such as WiFi card manufacturers, will not supply drivers for Win 10. The upgrade installs working "generic" drivers for any hardware item that doesn't have a compatible drivers. If there are any issues after the upgrade, you can search for newer drivers. Many Win 8.1 drivers will work. The Web search will alert you to any problems others have had. If you look at my Sig, you will see three Dells, 8,9, and 10 years old that have successfully upgraded and work fine. I even have video drivers that support all the features of the video cards.
Post back if you have any issues that you can't solve.
Please give me the cost on a buy back on my XPS 8500, I would like to use windows 10 and this pc is not supported.
Dell does not 'Buy Back' used Dell computers, best you can do is either sell it on eBay, or advertise it locally, on craigslist.
Note: I easily upgraded a 9 year old Inspiron 530 MT to Windows 10, from Windows 7.
Found out that Dell has a program for earning Dell gift cards by trading in your electronics, go Here: