This is only partly true. Office 2003 runs fine with Windows 10. the only issues I saw was with Powerpoint. If you click on shapes they will slightly move. This is especially bad if you hold CTRL and click because then your shapes will duplicate. I am actually running 2003 on a VM because it is a great version for what I use it for. other than that Excel, Word, Outlook, Access and everything else was fine. You can also run applications in compatibility mode if needed but Office 2003 didn't need that.