I have noticed how when people claim that Microsoft Office 2003 doesn't work at all on Windows 8.1 and Windows 10, they don't have evidence to say so.
Microsoft says that they don't support it anymore, not that it isn't compatible with the later version of Windows.
I have managed to get Office 2003 Pro to work with ease, no bugs or glitches, on Windows 7, 8.1 and 10 without using compatibility mode.
When people claim it can't open newer formats such as docx, you can if you install the official compatibility pack and you can save, edit and create new documents in that format.
But what I have noticed is how ridiculously fast Office 2003 performs its actions, such as booting up or saving. It performs and responds significantly faster than later versions. Later versions hog up more ram and take forever booting up. Isn't having all the options in front of you at once logically faster and more efficient than having it all hidden in the "Ribbon"?
Therefore, even today, Office 2003 decent enough for general day usage?
Is it worth upgrading?
(I have attached some screenshot of it in Windows 8.1 and 10)